FYI, .Net's regexp library has at least one feature that we'll have to wait til perl6 for: named captures. I wrote Regexp::NamedCaptures as an experiment to copy .Net's feature into perl5 but it's not something I'd want to use heavily. Also, .Net has the benefit of being parrot-like. You write code in multiple (Microsoft only) languages and they all compile down to the same thing. This lets you implement different parts of your stuff in the appropriate languages. I wouldn't be surprised if there was also support for your other two features: anonymous subs and closures.