Conditional statement

(?(...)|)

If the given pattern matches, matches the pattern before the vertical bar. Otherwise, matches the pattern after the vertical bar.

Examples

PCRE PYTHON

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