如何在正则表达式中添加连字符 [英] How to add hyphen to regex

问题描述

我遇到了这种模式

(\w+)

和 http://gskinner.com/RegExr/网站上，我了解\w =匹配字母数字字符和下划线，+ =匹配先前的标记1次或多次(不确定确切的含义).

and from http://gskinner.com/RegExr/ site I understand that \w = match alpha-numeric characters and underscores, and + = match previous token 1 or more times (not exactly sure what that means).

如何将连字符添加到列表中?

How can I add the hyphen character to the list?

我尝试了(\w\-+)，但是它不起作用，我没有找到任何匹配项...

I tried (\w\-+) but it doesn't work, I don't get any match ...

推荐答案

您需要一个字符类，用[...]表示.然后可以在字符类中使用\w并可以添加更多字符:

You need a character class, denoted by [...]. \w can then be used in the character class and more characters can be added:

[\w-]

但是请小心，如果您添加更多字符以进行匹配.连字符减号在类中必须为 first 或 last ，以避免将其解释为范围(或相应地对其进行转义).

Careful though, if you add more characters to match. The hyphen-minus needs to be first or last in a class to avoid interpreting it as a range (or escape it accordingly).

+是一个量词，因此它跟随一个标记(整个字符类是单个标记[\w]):

The + is a quantifier, so it goes after a token (where the whole character class is a single token [as is \w]):

([\w-]+)

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