The Flex Project: Vern Paxson, Will Estes, and John Millaway's The Flex Manual
Review this manual, which contains details on the Flex scanner generator. The link will take you to the introduction section of the manual. Use the links at the top of each page to navigate to the next page of the resource, reading up through section "24 Limitations". For further information, feel free to browse other parts of the manual, including the "Additional Readings" and "FAQ" sections.
Click https://web.archive.org/web/20160507035413/http://flex.sourceforge.net:80/manual/Introduction.html#Introduction link to open resource.