So I am playing with lpeg to replace a boost spirit grammar, I must say boost::spirit is far more elegant and natural than lpeg. However it is a bitch to work with due to the constraints of current...

In a normal PEG (parsing expression grammar) this is a valid grammar: values <- number (comma values)* number <- [0-9]+ comma <- ',' However, if I try to write this using LPeg the recur...

The following pattern (from this page) matches only strings with balanced parentheses: b = lpeg.P{ "(" * ((1 - lpeg.S"()") + lpeg.V(1))^0 * ")" } What does 1- in 1 - lpeg.S"()" mean? function g...

Part of a Lua application of mine is a search bar, and I'm trying to make it understand boolean expressions. I'm using LPeg, but the current grammar gives a strange result: > re, yajl = require...