正则表达式在字符串中重复检测 [英] Regular Expression to detect repetition within a string

问题描述

是否有可能发现用正则表达式重复号码模式？

Is it possible to detect repeated number patterns with a regular expression?

因此​​，举例来说，如果我有以下字符串034503450345，这将是可能的匹配重复序列0345？我有一种感觉，这是超出了正则表达式的范围，但我想我会反正在这里问，看看我是否错过了一些东西。

So for example, if I had the following string "034503450345", would it be possible to match the repeated sequence 0345? I have a feeling this is beyond the scope of regex, but I thought I would ask here anyway to see if I have missed something.

推荐答案

是的，你可以 - 这里是一个Python测试用例

Yes, you can - here's a Python test case

import re
print re.search(r"(\d+).*\1", "8034503450345").group(1)
# Prints 0345

正则表达式说再次找到数字部分序列，那么任何其他的东西量，那么相同的序列。

The regular expression says "find some sequence of digits, then any amount of other stuff, then the same sequence again."

在一个几乎没有 - 相关注意事项，这是我最喜欢的正则表达式中的一个 - 质数检测器：

On a barely-related note, here's one of my favourite regular expressions - a prime number detector:

import re
for i in range(2, 100):
    if not re.search(r"^(xx+)\1+$", "x"*i):
        print i

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