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- Subject: LPEG primer
- From: Lorenzo Donati <lorenzodonatibz@...>
- Date: Thu, 18 Nov 2010 08:57:18 +0100
I'm planning in the near future to start learning to use LPEG as a more
powerful alternative to regexes and Lua patterns (with added readability
and maintenance ease). Is there a good freely-available in-depth
primer/tutorial for that?
I've searched the internet for PEG and LPEG, but everything I found was
rather heavy on the Computer Science side. Although my CS skills are not
zero, they are still basic on the theoretical side. I know how to read
EBNF-like specs and know what a parser or lexer are and their general
working principles, but definitely I am not able to design a grammar
taking into account operator precedence, ambiguity, left-recursion and
the like (not that I need that so much, but only to give a hint to my
Therefore I'd need something practical, more focused on pattern matching
than on parsing languages. I need LPEG essentially for text searches and
simple string parsing for DSLs (very simple, math-like expressions
especially) - I cannot give more information on the specific needs
because for now I'd only like to learn LPEG in the hope it will help me
in the tasks for which I usually employ (sometimes fairly complex and
I only found an article by Gavin Wraith, but it is from 1997 and I don't
know if it is still current now that LPEG 0.10 has come out.
Moreover it is still a bit concise, albeit fairly clear. I also skimmed
through a scientific paper by Roberto, but although it gave me some more
hints, it was rather focused on the implementation of LPEG and less on
its practical use (of course I understand it was not meant as a tutorial
for non computer scientists). I also gave a look to LPEG recipes in the
Wiki, but I found them rather obscure (I realized I miss enough LPEG
background for those).
Any pointer is appreciated.