<p>The discussion you point out is more a suggested workaround to use Perl in a custom command than any actual discussion of adding such a facility to Geany.</p>
<p>The Glib regular expression library used by Geany allows such replacements, but it isn't used by Geany for replacements because it seems to only do <a href="https://developer.gnome.org/glib/stable/glib-Perl-compatible-regular-expressions.html#g-regex-replace">replace all</a>.  Somebody could provide a well written pull request to change Geany to use this.</p>

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