A replacement for the UNIX "lex" (lexical analyzer generator) program that is faster than lex, and freely redistributable. Lexical analyzer generators are generally used in combination with parser generators (such as yacc or bison), to generate frontends for language compilers and other tools. Version 2.3.7, an update to version 2.3 on disk 407. Includes source. Author: Jef Poskanzer, Vern Paxson, et. al.