Re^2: Driving the Engine right off the road

[swl]

If perl supported variable length lookbehind, you could use a lookbehind at the end:

Just a data point but Perl has limited variable length lookbehind as an experimental feature since version 5.30, with support for up to 255 characters. https://perldoc.perl.org/perlexperiment#(Limited)-Variable-length-look-behind

[ysth]

See also https://perldoc.perl.org/perl5360delta#Variable-length-lookbehind-is-mostly-no-longer-considered-experimental

I do wish it could work in even more cases, like where the beginning point is known (e.g. (?<=\A...) or with \G) or something like (?<=...\1...) where the length is known when running that part of the regex even if not when compiling it.