JavaScript正则表达式：字符串不包含

我不是女神ヾ 2023-02-22 03:43 22阅读 0赞

For some reason I think that regular expressions can solve every problem and for some reason I always find out the regular expression I'm trying to create is too complicated and probably not the best route to getting what I want.  Case in point:  I needed to create a regular expression which is meant to not match a string.  I *don't* want to match a string which includes `[requires-login]` but do want to match everything else.  Let's set aside the why for now, here's how I accomplished what I wanted:

由于某种原因，我认为正则表达式可以解决所有问题，并且由于某种原因，我总是发现我要创建的正则表达式过于复杂，可能不是获取所需内容的最佳途径。 举例：我需要创建一个正则表达式，该表达式不匹配字符串。 我*不想*匹配的字符串，其中包括`[requires-login]` ，但希望到别的匹配的一切。 让我们暂时搁下为什么，这是我如何实现我想要的：

// Adding extra forward slashes for "[" and "]"
    var regex = '^(?!.*?\\[requires-login\\])';
    
    // Compile
    var re = new RegExp(regex);

So why do I want to do this?  Within my intern client side tests, I mark tests requiring login as `[requires-login]`, and if a username and password aren't passed in via command line, I want to skip those tests.  In that case, I leverage intern's `grep` function to match tests without the given string.  I'd prefer to mark a few tests with `[requires-login]` instead of mark most of them as `[no-login]`.

那我为什么要这样做呢？ 在我的内部客户端测试中，我将需要登录的测试标记为`[requires-login]` ，如果没有通过命令行传递用户名和密码，我想跳过这些测试。 在那种情况下，我利用实习生的`grep`函数来匹配没有给定字符串的测试。 我宁愿用`[requires-login]`标记一些测试，而不是将大多数标记为`[no-login]` 。

Sometimes you want to do things within the web development world which aren't ideal but you simply need to accomplish them within a given parameter set.  This is one of those cases.  In the end you need to make it happen, and in this case, I did so!

有时候，您想在Web开发领域中做一些不理想的事情，而只需要在给定的参数集中完成它们即可。 这是其中一种情况。 最后，您需要实现它，在这种情况下，我做到了！

> 翻译自: [https://davidwalsh.name/javascript-regex-string][https_davidwalsh.name_javascript-regex-string]

[https_davidwalsh.name_javascript-regex-string]: https://davidwalsh.name/javascript-regex-string