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Abstract Packrat parsing is a novel and practical method for implementing linear-time parsers for grammars defined in Top-Down Parsing Language (TDPL).
Haskell - Writing a Regular Expression parser in Haskell: Part 2 - Matthew Manela - Farblondzshet in CodeThe first module in my simple regular expression parse is called RegexToNFA. This module exposes the types that make up a finite state machine and also the functions to convert a regular expression string into a finite state machine.
UPDATE: sorear from #haskell pasted a cool version of this here .
In the last three articles I covered the overall structure, lexer, and parser of a simple expression evaluator. This articles concludes by presenting the evaluator and main loop. At this stage we are able to take a string, tokenize it, and then build a tree representing the expression.
TagSoup is a library for parsing HTML/XML.