Recurse first subpattern

(?1)

Recursively match the first subpattern.

Examples

PCRE

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<!-- Embed Regex Token: (?1) -->
<code class="regex-token">(?1)</code> - Recurse first subpattern
<small><a href="https://testregex.com/cheatsheet/recurse-first-subpattern">See details</a></small>