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automaton This Java package contains a DFA/NFA (finite-state automata) implementation with Unicode alphabet (UTF16) and support for the standard regular expression operations (concatenation, union, Kleene star) and a number of non-standard ones (intersection, complement, etc.)

In contrast to many other automaton/regexp packages, this package is fast, compact, and implements real, unrestricted regular operations. It uses a symbolic representation based on intervals of Unicode characters.

The full source code and documentation is available under the BSD license.

The latest version 1.11-8 was released September 7, 2011. (ChangeLog)
New versions are announced via freshmeat.

The dk.brics.automaton package is developed by Anders Møller at Aarhus University, with contributions, suggestions and bug reports from Alexandar Bakic, Jodi Moran, Brandon Lee, David Lutterkort, John Gibson, Alex Meyer, Daniel Lowe, Harald Zauner, Dawid Weiss, Robert Muir, Hans-Martin Adorf, Dale Richardson, Yannick Versley, and Gustaf Lundh.