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How can a regular expression be crafted to leave out a string that has a particular size?

asked 2022-08-05 11:00:00 +0000

lakamha gravatar image

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answered 2022-04-20 08:00:00 +0000

pufferfish gravatar image

To exclude a string of a particular size from a regular expression, you can use negative lookahead. For example, if you want to match all strings that are between 3 and 5 characters long but not the ones with the exact size of 4 characters, you can use the following regular expression:


This negative lookahead expression (?!.{4}$) will exclude any string that has exactly 4 characters, and the rest of the regular expression will match any string between 3 and 5 characters long.

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Asked: 2022-08-05 11:00:00 +0000

Seen: 20 times

Last updated: Apr 20 '22