什么正则表达式可以匹配相同字符的序列? [英] What regex can match sequences of the same character?

问题描述

一个朋友问我这个问题，我很困惑:有没有办法制作一个匹配相同字符序列的正则表达式?例如，匹配 'aaa'、'bbb'，而不匹配 'abc'?

A friend asked me this and I was stumped: Is there a way to craft a regular expression that matches a sequence of the same character? E.g., match on 'aaa', 'bbb', but not 'abc'?

m|w{2,3}| 

不会成功，因为它会匹配 'abc'.

Wouldn't do the trick as it would match 'abc'.

m|a{2,3}| 

不会这样做，因为它不匹配 'bbb'、'ccc' 等

Wouldn't do the trick as it wouldn't match 'bbb', 'ccc', etc.

推荐答案

没问题！分组和参考是您的朋友:

Sure thing! Grouping and references are your friends:

(.)1+

将匹配 2 次或多次出现的相同字符.仅对于单词组成字符，使用 w 而不是 .，即:

Will match 2 or more occurences of the same character. For word constituent characters only, use w instead of ., i.e.:

(w)1+

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