JFlex is a lexical analyzer generator (also known as scanner generator) for Java. It is a fork of JLex, and can read JLex files.
JFlex is a flex-like lexer generator written in Java with emphasis on speed and full Unicode support. It has some not so usual features like negation in regexps and nested input streams.
These details are provided for information only. No information here is legal advice and should not be used as such.