https://github.com/haskell/alex

A lexical analyser generator for Haskell
https://github.com/haskell/alex

lexer-generator

Last synced: 12 days ago
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A lexical analyser generator for Haskell

• Host: GitHub
• URL: https://github.com/haskell/alex
• Owner: haskell
• License: bsd-3-clause
• Created: 2011-07-11T20:13:56.000Z (over 14 years ago)
• Default Branch: master
• Last Pushed: 2026-02-04T07:01:26.000Z (about 2 months ago)
• Last Synced: 2026-03-01T11:06:46.310Z (21 days ago)
• Topics: lexer-generator
• Language: Haskell
• Homepage: https://hackage.haskell.org/package/alex
• Size: 4.5 MB
• Stars: 320
• Watchers: 10
• Forks: 88
• Open Issues: 31
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • Contributing: CONTRIBUTING.rst
  • License: LICENSE

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README

          
# Alex: A Lexical Analyser Generator

[![CI](https://github.com/haskell/alex/actions/workflows/ci.yml/badge.svg)](https://github.com/haskell/alex/actions/workflows/ci.yml)

Alex is a tool for generating lexical analysers, also known as "lexers" and "scanners", in Haskell.

The lexical analysers implement a description of the tokens to be recognised in the form of regular expressions.

It is similar to the tools "lex" and "flex" for C/C++.

Share and enjoy!

## Documentation

Documentation is hosted on [Read the Docs](https://haskell-alex.readthedocs.io):

- [Online (HTML)](https://haskell-alex.readthedocs.io)

- [PDF](https://haskell-alex.readthedocs.io/_/downloads/en/latest/pdf/)

- [Downloadable HTML](https://haskell-alex.readthedocs.io/_/downloads/en/latest/htmlzip/)

For basic information of the sort typically found in a read-me, see the following sections of the docs:

- [About Alex](https://haskell-alex.readthedocs.io/en/latest/about.html)

- [Obtaining Alex](https://haskell-alex.readthedocs.io/en/latest/obtaining.html)

- [Contributing](https://haskell-alex.readthedocs.io/en/latest/contributing.html)