I'm using regex word boundary \b, and I'm trying to match a word in the following sentence but the result is not what I need. Connector Punctuations (such as underscore) are not being considered as a word boundary

Sentence: ab﹎cd_de_gf|ij|kl|mn|op_

Regexp: \\bkl\\b

However, de is not getting matched.

I tried updating the regexp to use unicode connector punctuation (it's product requirement as we support CJK languages as well) but that isn't working.

Regexp: (?<=\\b|[\p{Pc}])de(?=\\b|[\p{Pc}])

What am i missing here?

Note: (?<=\\b|_)de(?=\\b|_) seems to work for underscores but i need the regex to work for all the connector punctuations.

Thanks in advance !!

CodePudding user response：

Based on the use case you have described you can simplify your regex to:

(?<![[:alnum:]])de(?![[:alnum:]])

instead of trying to match word boundaries, unicode punctuation characters etc.

This will match de if it not followed or preceded by any alpha-numeric character.

CodePudding user response：

To match any connector punctuation characters you need \p{Pc}:

(?<=\\b|\\p{Pc})de(?=\\b|\\p{Pc})

NOTE: \p{Pc} can also be written as [_\u203F\u2040\u2054\uFE33\uFE34\uFE4D-\uFE4F\uFF3F] that matches all these 10 chars.