Last night, I mentioned that I wanted (?{ code }) in ruby and python.

I got bored tonight and decided to see how hard this would be to implement in ruby. Turns out it's not as bad as I thought, not that I'm finished yet.

This ruby script shows a demo of what I have so far. The output is in comments in the script. There's a few strange bugs yet, but I've nearly got it working properly. Something about my coding or the way oniguruma does backtracking/failures keeps this from working correctly on strings with multiple potential matches.