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> I'm looking for an email parser for lua, and came across Sean Conner's work [1]
> Trying to run it with Lpeg 0.12 you get a failure:
>     bad argument #1 to '?' (grammar has too many rules)
> It used to work with Lpeg 0.10 [2], what new limits has Lpeg 0.12 brought along?

LPeg 0.12 has a constant MAXRULES, which is currently defined as 200. Just
change that to a larger number and recompile LPeg. (And tell me how many
rules you need.)

(I thought 200 would be huge, but looking at your example 200 looks really
humble :)

-- Roberto