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Flex is a tool for generating programs that recognize lexical patterns in text. There are many applications for Flex, including writing compilers in conjunction with GNU Bison. Flex is a free implementation of the well known Lex program. It features a Lex compatibility mode, and also provides several new features such as exclusive start conditions.


User manual available in HTML, Info, ASCII, dvi, PostScript, and TeXinfo formats from


Download version 2.5.33 (developmental)
released on 21 February 2006


Related Projects


LicenseVerified byVerified onNotes
BSD AdClauseJanet Casey10 January 2003

Leaders and contributors

W. L. Estes Maintainer
Vern Paxson Contributor

Resources and communication

Audience Resource type URI
Bug Tracking VCS Repository Webview
Developer Mailing List Info/Archive
Support Mailing List Info/Archive

Software prerequisites

This entry (in part or in whole) was last reviewed on 28 July 2009.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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