On: Parsing Expression Grammar vs. Regexes: Building Org Parser in Lisp, Export HTML

[sparkie]

PEGs aren't contained within the context-free languages, so it's not really intuitive that they're weaker, particularly as nobody has yet come up with a context-free language that a PEG cannot parse. They're capable of parsing things context-free grammars cannot.

[earleybird → sparkie]

Ordered choice may cause a PEG parser to fail where a CFG parser would recognize the string.