解锁一个 GPT 功能，写正则表达式

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发现用 GPT 的一个新功能，用来写正则表达式。

写过正则表达式的人都知道，这东西不是人写的，更多的时候我们可能就直接用别人已经写好的。

下面又这样一个要求：

regex match exactly 20 alphabetical characters, including uppercase, lowercase, and characters with diacritical marks

正则表达式需要找到 20 个英文字符。

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To match exactly 20 alphabetical characters, including uppercase, lowercase, and characters with diacritical marks, you can use the following regex pattern:

^[\p{L}\p{Mn}]{20}$

This pattern breaks down as follows:

  • ^ asserts the start of the string.
  • [\p{L}\p{Mn}] matches any Unicode letter (\p{L}) or nonspacing mark (\p{Mn}).
  • {20} specifies that exactly 20 characters of the defined class should be matched.
  • $ asserts the end of the string.

You can use this regex pattern to check if a string consists of exactly 20 alphabetical characters, including uppercase, lowercase, and characters with diacritical marks.

上面的正则表达式还考虑了多语言环境，如果只是为了匹配英文字符的话，就没有那么复杂了。

可以使用下面的正则表达式：

^[a-zA-Z]{20}$