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A comment on PEG Parsers. Parent comment
http://leafo.net/guides/parsing-expression-grammars.html
http://www.wra1th.plus.com/lua/lpeg.html
http://www.wra1th.plus.com/lua/peg/PEG.html
http://lua-users.org/wiki/LpegTutorial
https://rawgit.com/dlaurie/lua-notes/master/lpeg-brief.html
http://www.inf.puc-rio.br/~roberto/lpeg/
http://lua-users.org/wiki/LpegRecipes
This is probably the best reason I've seen why you should learn parsing.
http://leafo.net/guides/parsing-expression-grammars.html
http://www.wra1th.plus.com/lua/lpeg.html
http://www.wra1th.plus.com/lua/peg/PEG.html
http://lua-users.org/wiki/LpegTutorial
https://rawgit.com/dlaurie/lua-notes/master/lpeg-brief.html
http://www.inf.puc-rio.br/~roberto/lpeg/
http://lua-users.org/wiki/LpegRecipes