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tldr/pages/common/flex.md
Vitor Henrique c19a39c1d4
lex: add examples and add {Free,Net,Open}BSD pages (#11895) 
* lex: add examples and add other BSD

* lex: fix OpenBSD man link

* lex: remove unsupported option from OpenBSD

* lex: apply suggestions from code review

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

* flex, lex: moving flex options to common/flex.md

* lex: mention `lex` alias to `flex`

* Update pages/linux/lex.md

---------

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
2024-01-07 14:44:19 +05:30

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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}}