This manual documents flex. It covers release 2.5.
flex
1. Name 2. Synopsis 3. Overview 4. Description 5. Some simple examples 6. Format of the input file 7. Patterns 8. How the input is matched 9. Actions 10. The generated scanner 11. Start conditions 12. Multiple input buffers 13. End-of-file rules 14. Miscellaneous macros 15. Values available to the user 16. Interfacing with yacc 17. Options 18. Performance considerations 19. Generating C++ scanners 20. Incompatibilities with lex and POSIX 21. Diagnostics 22. Files 23. Deficiencies / Bugs 24. See also 25. Author
yacc
lex