flex

Lexical analyzer generator. A rewrite of lex with extensions to the POSIX specification. Given the specification for a lexical analyzer, generates C code implementing it. Note: long options don't work on OpenBSD. More information: https://manned.org/flex.

lex analyzer.l

lex --stdout|t analyzer.l

lex analyzer.l -o analyzer.c

lex -B analyzer.l

cc path/to/lex.yy.c --output executable