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I love LPEG for Lua. It usually takes me some time to write a decent grammar, but once it works it is rather straightforward to read it. (http://www.inf.puc-rio.br/~roberto/lpeg/lpeg.html)

Now seeing this for javascript makes me think if I should actually do more work with js.

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Amen on the easy to read part. I'm the author of clj-peg ( http://www.lithinos.com/clj-peg/ ), and the main reason I wanted to write it was to have grammars that were human readable.

I'm really interested in human-readable grammars. Thanks for your work.

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