It is also a rewrite of the very useful tool JLex which was developed by Elliot Berk at Princeton University. As Vern Paxon 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.