Can you give one example where dividing by a regexp is not hopelessly obfuscatory? If I saw someone trying to do that in production code, I would hesitate between shooting them first and then throwing them out the window, or doing it the other way around :)

Although I would be slightly more worried about the ambiguity between // "that unless defined this" and // "rematch according to the last successfully compiled regexp" (although maybe that's going away in Perl 6, I've lost track). And anyway, I'll let Larry and Damian worry about that for the time being.

g r i n d e r