I don't know about the YAPE::Regex tree, but the rule seems to be: If you have a negative lookbehind and a backreference to it, it stays in the same position, but becomes a positive lookahead on the backreference to its mirror'ed element.
- In general, if you think something isn't in Perl, try it out, because it usually is. :-)
- "What is the sound of Perl? Is it not the sound of a wall that people have stopped banging their heads against?"