Seriously, someone on IRC the other day was claiming that they already had a P6RE-in-P5 implementation, and did show me some code, but I've forgotten where it lives or their real name.
http://www.liacs.nl/~mavduin/P6P5_0.00_01.tar.gz
That someone would be me :-)
I should note that this version has wrong semantics: it is incapable of doing backtracking in various cases including subrules. It only does backtracking within subexpressions that only does "simple" regex (because I translate that to a single perl 5 regex match)
My attempt at getting its semantics right is what triggered all my recent backtracking-related posts. (since continuations are unavailable, it looks like I'll have to settle for the callback system)
-- Matthijs van Duin -- May the Forth be with you!
