This is the revision history for regex in <libera.chat:#regexen>

factoid_idsubjectcopulapredicateauthornamespace
16026 regex is <echo>
digitok <freenode.net:#regex>
16025 regex is <echo> digitok <freenode.net:#regex>
16020 regex 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
simcop2387 <freenode.net:#regex>
16019 regex 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; $x]', $_, $l;!!
onlinecop
simcop2387 <freenode.net:#regex>
15147 regex is digitok <freenode.net:#regex>
11641 regex is <echo>
simcop2387 <freenode.net:#regex>
11636 regex is boop digitok <freenode.net:#regex>
11635 regex is <echo>
Not Available
simcop2387 <freenode.net:#regex>