Command-line tool

flex

brew/flex

Checked 25 Oct 2026, 21:09 UTC · Listing refreshed from Homebrew, winget, npm, Scoop and cargo; npm packages checked against OSV.dev

Fast Lexical Analyzer, generates Scanners (tokenizers)

Website Source

At a glance

Type

Command-line tool

Install on

macOS

Last checked

25 Oct 2026, 21:09 UTC

Install it

macOS

brew install flex

Generate an analyzer from a Lex file, storing it to the file `lex.yy.c`

flex analyzer.l

Write analyzer to `stdout`

flex -t analyzer.l

Specify the output file

flex analyzer.l -o analyzer.c

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