Negative lookbehind

(?<!...)

Ensures that the given pattern would not match and end at the current position in the expression. Does not consume characters.

Examples

Match Sample:

not foo but foo

Regex Example:

(?<!not )foo

PCRE PYTHON

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