In message "[ruby-talk:9078] Re: Regexp for matching Ruby reg exps?" > on 01/01/11, "Ben Tilly" <ben_tilly / hotmail.com> writes: > >Friedl's solution only handles nesting to a limited depth. > >Enough for parsing email addresses but not a general > >solution. Not only is handling arbitrary nesting in a Which means that if you build a parser to handle nesting of parens up to, say, 1000 deep, that you'd be able to defeat this parser by giving it an expression with a deeper nesting than that. Theoretically true but not very practical. Realistically, assuming some reasonable fixed limit on nesting, is the problem then (fairly simply) solveable? craig