Reset match
\KSets the given position in the regex as the new "start" of the match. This means that nothing preceding the \K will be captured in the overall match.
Examples
PCRE
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<!-- Embed Regex Token: \K --> <code class="regex-token">\K</code> - Reset match <small><a href="https://testregex.com/cheatsheet/reset-match">See details</a></small>