Cudder is a hypocrite

How can a man woman hate bison/yacc when he she likes regex?

Regexp is just a string encoding of a finite state automata and you write it yourself for whatever problem you are trying to solve. Parser generators generate push down automata capable of general purpose computation until they run out of memory, usually in complex and incomprehensible ways. Then they're that pesky incompleteness theory that rises its ugly, throbbing cock where ever grammars are around.