哪些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，我很沮丧:是否有一种方法可以制作与相同字符序列匹配的正则表达式?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}| 

不会成功，因为它与'bbb'，'ccc'等不匹配.

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

推荐答案

当然！分组和引用是您的朋友:

Sure thing! Grouping and references are your friends:

(.)\1+

将匹配2个或更多相同字符的事件.仅对于单词构成字符，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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