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.

  • Generate an analyzer from a flex file, storing it to the file lex.yy.c:

lex analyzer.l

  • Write analyzer to stdout:

lex --stdout|t analyzer.l

  • Specify the output file:

lex analyzer.l -o analyzer.c

  • Generate a [B]atch scanner instead of an interactive scanner:

lex -B analyzer.l

  • Compile a C file generated by Lex:

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

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