用于匹配类似Twitter的主题标签的Javascript正则表达式 [英] Javascript regex for matching twitter-like hashtags

问题描述

我想帮助找出用于识别hashtags的JS正则表达式，它们应该匹配以下所有内容：

I'd like some help on figuring out the JS regex to use to identify "hashtags", where they should match all of the following:

1. 通常的twitter风格主题标签： #foobar


2. 前面有文字的Hashtags： abc123＃xyz456


3. 其中带有空格的Hashtags，表示为：＃[foo bar] （也就是说，[]作为标签的分隔符）

1. The usual twitter style hashtags: #foobar
2. Hashtags with text preceding: abc123#xyz456
3. Hashtags with space in them, which are denoted as: #[foo bar] (that is, the [] serves as delimiter for the hashtag)

对于1和2，我使用了某些东西以下形式：

For 1 and 2, I was using something of the following form:

var all_re =/\S*#\S+/gi;

我似乎无法弄清楚如何将它扩展到3.我不擅长regexps，请帮忙吗？

I can't seem to figure out how to extend it to 3. I'm not good at regexps, some help please?

谢谢！

推荐答案

所以它必须匹配所有非空格字符或（包括） [和] 之间的任何字符：

So it has to match either all non-space characters or any characters between (and including) [ and ]:

\S*#(?:\[[^\]]+\]|\S+)

说明：

\S*                # any number of non-white space characters
#                  # matches #
(?:                # start non-capturing group
    \[             # matches [
    [^\]]+         # any character but ], one or more
    \]             # matches ]
    |              # OR
    \S+            # one or more non-white space characters
)                  # end non-capturing group

参考：交替，否定了角色类。

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