Lexical Analyzer and Parser Generator

Lex & Yacc / Flex & Bison Primer 
[Html] http://ds9a.nl/lex-yacc/cvs/output/lexyacc.html#toc1 

A little manual for Lex and Yacc 
[Html] http://pltplp.net/lex-yacc/ 

Flex Manual "Lex" 
[Html] http://flex.sourceforge.net/manual/ 

Bison Manual "Yacc" 
[Html] http://www.gnu.org/software/bison/manual/html_mono/bison.html 
[Pdf] http://www.gnu.org/software/bison/manual/pdf/bison.pdf 

source: http://www.gtkforums.com/about988.html