Description:

JFlex is a lexical analyzer generator (also known as scanner
generator) for Java(tm), written in Java(tm). It is also a rewrite of
the very useful tool JLex which was developed by Elliot Berk at
Princeton University. As Vern Paxson states for his C/C++ tool flex:
They do not share any code though. JFlex is designed to work together
with the LALR parser generator CUP by Scott Hudson, and the Java
modification of Berkeley Yacc BYacc/J by Bob Jamison. It can also be
used together with other parser generators like ANTLR or as a
standalone tool.