Negative lookahead

(?!...)

Starting at the current position in the expression, ensures that the given pattern will not match. Does not consume characters.

Examples

Match Sample:

foobar foobaz

Regex Example:

foo(?!bar)

PCRE JAVASCRIPT PYTHON

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<!-- Embed Regex Token: (?!...) -->
<code class="regex-token">(?!...)</code> - Negative lookahead
<small><a href="https://testregex.com/cheatsheet/negative-lookahead">See details</a></small>