This is the revision history for re in <libera.chat:#reg3x>

factoid_idsubjectcopulapredicateauthornamespace
16024 re is `compose `eval use PPR; $x=`quote d `arg!!; ($l, $r) = ($x=~m/((?&PerlSubstitution))\s+(.*)$PPR::GRAMMAR/); $_=$r; s/'/\\'/; sprintf '[eval $x=\'%s\'; $x =~ %s; "output: ".$x]', $_, $l;!!
Error: unmatched opening parenthesis in compose
digitok <freenode.net:#regex>