[Python3]爬虫入门之正则表达式

男娘i 2022-06-06 00:48 195阅读 0赞

强烈推荐**https://regexr.com/**该网站。

使用该网站，查看表达式每一项是什么意思。很快就可以掌握正则了！！！从来没觉得正则是如此的简单！

好了。

在前面我们已经搞定了怎样获取页面的内容，不过还差一步，这么多杂乱的代码夹杂文字我们怎样把它提取出来整理呢？下面就开始介绍一个十分强大的工具，正则表达式！

## 1.了解正则表达式 ##

> 正则表达式是对字符串操作的一种逻辑公式，就是用事先定义好的一些特定字符、及这些特定字符的组合，组成一个“规则字符串”，这个“规则字符串”用来表达对字符串的一种过滤逻辑。

正则表达式是用来匹配字符串非常强大的工具，在其他编程语言中同样有正则表达式的概念，Python同样不例外，利用了正则表达式，我们想要从返回的页面内容提取出我们想要的内容就易如反掌了。

> 正则表达式的大致匹配过程是：  
> 1.依次拿出表达式和文本中的字符比较，  
> 2.如果每一个字符都能匹配，则匹配成功；一旦有匹配不成功的字符则匹配失败。  
> 3.如果表达式中有量词或边界，这个过程会稍微有一些不同。

## 2.正则表达式的语法规则 ##

下面是Python中正则表达式的一些匹配规则，图片资料来自CSDN

[![20130515113723855][]][20130515113723855 1]

## 3.正则表达式相关注解 ##

### （1）数量词的贪婪模式与非贪婪模式 ###

正则表达式通常用于在文本中查找匹配的字符串。Python里数量词默认是贪婪的（在少数语言里也可能是默认非贪婪），总是尝试匹配尽可能多的字符；非贪婪的则相反，总是尝试匹配尽可能少的字符。例如：正则表达式”ab\*”如果用于查找”abbbc”，将找到”abbb”。而如果使用非贪婪的数量词”ab\*?”，将找到”a”。

注：我们一般使用非贪婪模式来提取。

### （2）反斜杠问题 ###

与大多数编程语言相同，正则表达式里使用”\\”作为转义字符，这就可能造成反斜杠困扰。假如你需要匹配文本中的字符”\\”，那么使用编程语言表示的正则表达式里将需要4个反斜杠”\\\\\\\\”：前两个和后两个分别用于在编程语言里转义成反斜杠，转换成两个反斜杠后再在正则表达式里转义成一个反斜杠。

Python里的原生字符串很好地解决了这个问题，这个例子中的正则表达式可以使用r”\\\\”表示。同样，匹配一个数字的”\\\\d”可以写成r”\\d”。有了原生字符串，妈妈也不用担心是不是漏写了反斜杠，写出来的表达式也更直观勒。

## 4.Python Re模块 ##

Python 自带了re模块，它提供了对正则表达式的支持。主要用到的方法列举如下

在介绍这几个方法之前，我们先来介绍一下pattern的概念，pattern可以理解为一个匹配模式，那么我们怎么获得这个匹配模式呢？很简单，我们需要利用re.compile方法就可以。例如

在参数中我们传入了原生字符串对象，通过compile方法编译生成一个pattern对象，然后我们利用这个对象来进行进一步的匹配。

另外大家可能注意到了另一个参数 flags，在这里解释一下这个参数的含义：

参数flag是匹配模式，取值可以使用按位或运算符’|’表示同时生效，比如re.I | re.M。

可选值有：

在刚才所说的另外几个方法例如 re.match 里我们就需要用到这个pattern了，下面我们一一介绍。

> 注：以下七个方法中的flags同样是代表匹配模式的意思，如果在pattern生成时已经指明了flags，那么在下面的方法中就不需要传入这个参数了。

### （1）re.match(pattern, string\[, flags\]) ###

这个方法将会从string（我们要匹配的字符串）的开头开始，尝试匹配pattern，一直向后匹配，如果遇到无法匹配的字符，立即返回None，如果匹配未结束已经到达string的末尾，也会返回None。两个结果均表示匹配失败，否则匹配pattern成功，同时匹配终止，不再对string向后匹配。下面我们通过一个例子理解一下

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     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       44 
     </div> 
    </div> </td> 
   <td style="font-family:Monaco,MonacoRegular,&quot;Courier New&quot;,monospace!important; vertical-align:top!important; border:0px; padding:0px!important; margin:0px!important; background:0px center; width:788px"> 
    <div style="padding-right:0px; padding-left:0px; margin:0px; white-space:pre; overflow:visible; background:none!important; border:none!important; padding-top:5px!important; padding-bottom:3px!important; line-height:15px!important"> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">__author__</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">=</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'CQC'</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># -*- coding: utf-8 -*-</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important">#导入re模块</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">import </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">re</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># 将正则表达式编译成Pattern对象，注意hello前面的r的意思是“原生字符串”</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">pattern</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">=</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">re</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">compile</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">r</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'hello'</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># 使用re.match匹配文本，获得匹配结果，无法匹配时将返回None</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result1</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">=</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">re</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">match</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">pattern</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'hello'</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result2</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">=</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">re</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">match</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">pattern</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'helloo CQC!'</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result3</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">=</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">re</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">match</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">pattern</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'helo CQC!'</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result4</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">=</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">re</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">match</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">pattern</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'hello CQC!'</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important">#如果1匹配成功</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important">if</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result1</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">:</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># 使用Match获得分组信息</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">print </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result1</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">group</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important">else</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">:</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'1匹配失败！'</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important">#如果2匹配成功</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important">if</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result2</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">:</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># 使用Match获得分组信息</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
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      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result2</span> 
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     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important">else</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">:</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'2匹配失败！'</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important">#如果3匹配成功</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important">if</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result3</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">:</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># 使用Match获得分组信息</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">print </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result3</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">group</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important">else</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">:</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'3匹配失败！'</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important">#如果4匹配成功</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important">if</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
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      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">:</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># 使用Match获得分组信息</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">print </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">result4</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">group</span> 
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     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important">else</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">:</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'4匹配失败！'</span> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

运行结果

匹配分析

1.第一个匹配，pattern正则表达式为’hello’，我们匹配的目标字符串string也为hello，从头至尾完全匹配，匹配成功。

2.第二个匹配，string为helloo CQC，从string头开始匹配pattern完全可以匹配，pattern匹配结束，同时匹配终止，后面的o CQC不再匹配，返回匹配成功的信息。

3.第三个匹配，string为helo CQC，从string头开始匹配pattern，发现到 ‘o’ 时无法完成匹配，匹配终止，返回None

4.第四个匹配，同第二个匹配原理，即使遇到了空格符也不会受影响。

我们还看到最后打印出了result.group()，这个是什么意思呢？下面我们说一下关于match对象的的属性和方法  
Match对象是一次匹配的结果，包含了很多关于此次匹配的信息，可以使用Match提供的可读属性或方法来获取这些信息。

> 属性：  
> 1.string: 匹配时使用的文本。  
> 2.re: 匹配时使用的Pattern对象。  
> 3.pos: 文本中正则表达式开始搜索的索引。值与Pattern.match()和Pattern.seach()方法的同名参数相同。  
> 4.endpos: 文本中正则表达式结束搜索的索引。值与Pattern.match()和Pattern.seach()方法的同名参数相同。  
> 5.lastindex: 最后一个被捕获的分组在文本中的索引。如果没有被捕获的分组，将为None。  
> 6.lastgroup: 最后一个被捕获的分组的别名。如果这个分组没有别名或者没有被捕获的分组，将为None。
> 
> 方法：  
> 1.group(\[group1, …\]):  
> 获得一个或多个分组截获的字符串；指定多个参数时将以元组形式返回。group1可以使用编号也可以使用别名；编号0代表整个匹配的子串；不填写参数时，返回group(0)；没有截获字符串的组返回None；截获了多次的组返回最后一次截获的子串。  
> 2.groups(\[default\]):  
> 以元组形式返回全部分组截获的字符串。相当于调用group(1,2,…last)。default表示没有截获字符串的组以这个值替代，默认为None。  
> 3.groupdict(\[default\]):  
> 返回以有别名的组的别名为键、以该组截获的子串为值的字典，没有别名的组不包含在内。default含义同上。  
> 4.start(\[group\]):  
> 返回指定的组截获的子串在string中的起始索引（子串第一个字符的索引）。group默认值为0。  
> 5.end(\[group\]):  
> 返回指定的组截获的子串在string中的结束索引（子串最后一个字符的索引+1）。group默认值为0。  
> 6.span(\[group\]):  
> 返回(start(group), end(group))。  
> 7.expand(template):  
> 将匹配到的分组代入template中然后返回。template中可以使用\\id或\\g、\\g引用分组，但不能使用编号0。\\id与\\g是等价的；但\\10将被认为是第10个分组，如果你想表达\\1之后是字符’0’，只能使用\\g0。

下面我们用一个例子来体会一下

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 <tbody> 
  <tr style="background:0px center; padding:0px!important; border:none!important; vertical-align:top!important; margin:0px!important"> 
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    <div style="background:0px center; border:0px; padding-right:0px; padding-left:0px; margin:0px; white-space:nowrap; padding-top:5px!important; padding-bottom:3px!important; line-height:15px!important"> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
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       13 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       14 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       15 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       16 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       17 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       18 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       19 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       20 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       21 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       22 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       23 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       24 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       25 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       26 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       27 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       28 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       29 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       30 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       31 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       32 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       33 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       34 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       35 
     </div> 
     <div style="font-family:inherit; background:0px center; border-top:0px; border-right:1px solid rgb(222,222,222)!important; border-bottom:0px; border-left:0px; padding:0px 5px; margin:0px; text-align:right!important; height:15px; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; min-width:1.2em!important; color:rgb(170,170,170)!important">
       36 
     </div> 
    </div> </td> 
   <td style="font-family:Monaco,MonacoRegular,&quot;Courier New&quot;,monospace!important; vertical-align:top!important; border:0px; padding:0px!important; margin:0px!important; background:0px center; width:788px"> 
    <div style="padding-right:0px; padding-left:0px; margin:0px; white-space:pre; overflow:visible; background:none!important; border:none!important; padding-top:5px!important; padding-bottom:3px!important; line-height:15px!important"> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># -*- coding: utf-8 -*-</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important">#一个简单的match实例</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">import </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">re</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># 匹配如下内容：单词+空格+单词+任意字符</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important">=</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">re</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">match</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">r</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'(\w+) (\w+)(?P&lt;sign&gt;.*)'</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'hello world!'</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important">
       &nbsp; 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.string:"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important; color:rgb(128,0,128)!important">string</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.re:"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">re</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.pos:"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">pos</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.endpos:"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">endpos</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.lastindex:"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">lastindex</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.lastgroup:"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">lastgroup</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.group():"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">group</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.group(1,2):"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">group</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,153,153)!important">1</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,153,153)!important">2</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.groups():"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">groups</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.groupdict():"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">groupdict</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.start(2):"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">start</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,153,153)!important">2</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.end(2):"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:bold!important">end</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,153,153)!important">2</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.span(2):"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">span</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,153,153)!important">2</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">print</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">r</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">"m.expand(r'\g \g\g'):"</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">,</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"> </span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,45,122)!important">m</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">.</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:teal!important">expand</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">(</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important">r</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(221,17,68)!important">'\2 \1\3'</span> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(51,51,51)!important">)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(0,111,224)!important"></span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important">### output ###</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.string: hello world!</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.re: </span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.pos: 0</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.endpos: 12</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.lastindex: 3</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.lastgroup: sign</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.group(1,2): ('hello', 'world')</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.groups(): ('hello', 'world', '!')</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.groupdict(): {'sign': '!'}</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.start(2): 6</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.end(2): 11</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.span(2): (6, 11)</span> 
     </div> 
     <div style="font-family:inherit; background:0px center; border:0px; padding:0px 5px; margin:0px; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important"> 
      <span style="font-family:inherit; height:inherit; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; color:rgb(184,92,0)!important"># m.expand(r'\2 \1\3'): world hello!</span> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

### （2）re.search(pattern, string\[, flags\]) ###

search方法与match方法极其类似，区别在于match()函数只检测re是不是在string的开始位置匹配，search()会扫描整个string查找匹配，match（）只有在0位置匹配成功的话才有返回，如果不是开始位置匹配成功的话，match()就返回None。同样，search方法的返回对象同样match()返回对象的方法和属性。我们用一个例子感受一下

###  （3）re.split(pattern, string\[, maxsplit\]) ###

按照能够匹配的子串将string分割后返回列表。maxsplit用于指定最大分割次数，不指定将全部分割。我们通过下面的例子感受一下。

### （4）re.findall(pattern, string\[, flags\]) ###

搜索string，以列表形式返回全部能匹配的子串。我们通过这个例子来感受一下

### （5）re.finditer(pattern, string\[, flags\]) ###

搜索string，返回一个顺序访问每一个匹配结果（Match对象）的迭代器。我们通过下面的例子来感受一下

### （6）re.sub(pattern, repl, string\[, count\]) ###

使用repl替换string中每一个匹配的子串后返回替换后的字符串。  
当repl是一个字符串时，可以使用\\id或\\g、\\g引用分组，但不能使用编号0。  
当repl是一个方法时，这个方法应当只接受一个参数（Match对象），并返回一个字符串用于替换（返回的字符串中不能再引用分组）。  
count用于指定最多替换次数，不指定时全部替换。

### （7）re.subn(pattern, repl, string\[, count\]) ###

返回 (sub(repl, string\[, count\]), 替换次数)。

## 5.Python Re模块的另一种使用方式 ##

在上面我们介绍了7个工具方法，例如match，search等等，不过调用方式都是 re.match，re.search的方式，其实还有另外一种调用方式，可以通过pattern.match，pattern.search调用，这样调用便不用将pattern作为第一个参数传入了，大家想怎样调用皆可。

函数API列表

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    </div> </td> 
  </tr> 
 </tbody> 
</table>

具体的调用方法不必详说了，原理都类似，只是参数的变化不同。小伙伴们尝试一下吧~

小伙伴们加油，即使这一节看得云里雾里的也没关系，接下来我们会通过一些实战例子来帮助大家熟练掌握正则表达式的。

[20130515113723855]: /images/20220606/35c9f841a0fb4fb5a7fabe9acf79f33b.png
[20130515113723855 1]: http://qiniu.cuiqingcai.com/wp-content/uploads/2015/02/20130515113723855.png