On: What Pythonistas Think of Ruby

[draegtun]

pyparsing, the equivalent of which I haven't seen in any other language

Well the "golden oldie" equivalent in the Perl world is Parse::RecDescent (http://search.cpan.org/dist/Parse-RecDescent/).

A new kid on the block is Regexp::Grammars (http://search.cpan.org/dist/Regexp-Grammars/), which is heavily based on Perl 6 rules/grammar (http://en.wikipedia.org/wiki/Perl_6_rules).