正则表达式仅用于数字

╰+攻爆jí腚メ 2022-11-24 14:20 213阅读 0赞

本文翻译自：[Regex for numbers only][]

*I haven't used regular expressions at all, so I'm having difficulty troubleshooting.* **我根本没有使用过正则表达式，因此我很难进行故障排除。** *I want the regex to match only when the contained string is all numbers;* **我希望正则表达式仅在包含的字符串为全数字时才匹配；** *but with the two examples below it is matching a string that contains all numbers plus an equals sign like "1234=4321".* **但是在下面的两个示例中，它匹配包含所有数字和等号（例如“ 1234 = 4321”）的字符串。** *I'm sure there's a way to change this behavior, but as I said, I've never really done much with regular expressions.* **我敢肯定有一种方法可以改变这种行为，但是正如我所说，我从未真正对正则表达式做过很多事情。**

string compare = "1234=4321";
    Regex regex = new Regex(@"[\d]");
    
    if (regex.IsMatch(compare))
    { 
        //true
    }
    
    regex = new Regex("[0-9]");
    
    if (regex.IsMatch(compare))
    { 
        //true
    }

*In case it matters, I'm using C\# and .NET2.0.* **万一重要，我使用的是C＃和.NET2.0。**

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### \#1楼 ###

参考：[https://stackoom.com/question/193v/正则表达式仅用于数字][https_stackoom.com_question_193v]

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### \#2楼 ###

*Another way: If you like to match international numbers such as Persian or Arabic, so you can use following expression:* **另一种方式：如果您想匹配波斯或阿拉伯等国际号码，则可以使用以下表达式：**

Regex = new Regex(@"^[\p{N}]+$");

*To match literal period character use:* **要匹配文字字符，请使用：**

Regex = new Regex(@"^[\p{N}\.]+$");

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### \#3楼 ###

*Perhaps my method will help you.* **也许我的方法会对您有所帮助。**

public static bool IsNumber(string s)
        {
            return s.All(char.IsDigit);
        }

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### \#4楼 ###

*This works with integers and decimal numbers.* **这适用于整数和十进制数。** *It doesn't match if the number has the coma thousand separator ,* **如果数字带有逗号分隔符，则不匹配，**

"^-?\\d*(\\.\\d+)?$"

*some strings that matches with this:* **与此匹配的一些字符串：**

894
    923.21
    76876876
    .32
    -894
    -923.21
    -76876876
    -.32

*some strings that doesn't:* **一些没有的字符串：**

hello
    9bye
    hello9bye
    888,323
    5,434.3
    -8,336.09
    87078.

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### \#5楼 ###

*Sorry for ugly formatting.* **抱歉，格式不正确。** *For any number of digits:* **对于任何数字：**

[0-9]*

*For one or more digit:* **对于一位或多位数字：**

[0-9]+

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### \#6楼 ###

*If you need to check if all the digits are number (0-9) or not,* **如果您需要检查所有数字是否都是数字（0-9），**

^[0-9]+$

*1425 TRUE* **1425是**

*0142 TRUE* **0142是**

*0 TRUE* **0是**

*1 TRUE* **1是**

*154a25 FALSE* **154a25错误**

*1234=3254 FALSE* **1234 = 3254假**

[Regex for numbers only]: https://oldbug.net/q/193v/Regex-for-numbers-only
[https_stackoom.com_question_193v]: https://stackoom.com/question/193v/%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E4%BB%85%E7%94%A8%E4%BA%8E%E6%95%B0%E5%AD%97