I've steered more to composing grammars by using tools like Regexp::Grammars - https://metacpan.org/pod/Regexp::Grammars https://metacpan.org/pod/Regexp::Gramma

I've steered more to composing grammars by using tools like Regexp::Grammars - https://metacpan.org/pod/Regexp::Grammars https://metacpan.org/pod/Regexp::Grammars The real sweet spot I've found is parse in Rebol / Red - http://blog.hostilefork.com/why-rebol-red-parse-cool/ http://blog.hostilefork.com/why-rebol-red-parse-cool/ | http://www.rebol.com/docs/core23/rebolcore-15.html http://www.rebol.com/docs/core23/rebolcore-15.html