当任意模式出现多次时匹配 [英] Matching when an arbitrary pattern appears multiple times

问题描述

我正在尝试编写一个正则表达式，当长度为 2 或更大的任意模式在短语中多次出现时，该正则表达式将成功.本质上，我想在搜索中使用捕获组.

I'm trying to write a regex that will succeed when an arbitrary pattern of length 2 or greater appears more than once in a phrase. Essentially, I would like to use a capture group in the search.

类似的东西，但概括为匹配任何短语，而不仅仅是 foo

Something like this, but generalized to match any phrase, not just foo

/foo.*foo/

例如

应该匹配:

abcdabcd     ('abcd' is repeated)
foobarfoo    ('foo' is repeated)
mathematics  ('mat' is repeated)

不应该匹配:

bar        (no repetition of any pattern)
foo        ('o' is repeated but it is not length>=2)

正则表达式可以做到这一点吗?还是我应该使用其他东西?

Can regexes do this? Or should I be using something else?

推荐答案

您可以使用这个基于前瞻的正则表达式:

You can use this lookahead based regex:

(.{2,})(?=.*?\1)

正则表达式演示

说明:

.{2,}     # any 2 or more characters
(.{2,})   # group them into captured group #1
(?=...)   # positive lookahead
(?=.*?\1) # make sure at least one occurrence of captured group #1

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