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Asked: 2026-05-15T06:44:58+00:00

^(.)+\S{10}(.)+$ I have that regex which will match any string that contains a word

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^(.)+\S{10}(.)+$

I have that regex which will match any string that contains a word of 10 characters.
However I need the INVERSE of that.
A regex that will only match strings which do NOT have words of >=10 characters.

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1 Answer

  1. Editorial Team

    Use negative assertion.

    (?!.*\S{10})

    \S{10} matches a sequence of 10 \S (which must be a subsequence of anything longer). (?!pattern) is a negative lookahead, an assertion that is true if the pattern doesn’t match. .* allows the lookahead to look as far as necessary.

    The whole pattern therefore is

    ^(?!.*\S{10}).*$

    This matches all string that do NOT contain \S{10}.

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