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I was and also when scanning/lexing. My limited PEG parsing experience is with peg/leg by http://piumarta.com/software/peg/ and http://pegjs.majda.cz which is a Javascript PEG parser. Both very cool projects.

Looks like they do not include the optimisations I mentioned. But for this sort of use cases that would have been an overkill anyway.

So do you have an example of a PEG parser that uses these so called memorisation optimisation techniques then?