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Regexp testing tool allows to apply group of regexps to huge arrays of data (millions or so) in order to investigate search or search/replacement possibilities of regexp group.
This program allows you to specify a Deterministic Finite Automata, Nondeterministic Finite Automata, or Generalized NFA and will return a regular expression which recognizes the same language as the FA you described.
AMoRE is a collection of algorithms that deal with automata, monoids, regular expressions. Learn about the theory - this is not another regexp package.
GraphSpider is a pattern matcher which searches parsed text in phrase-structure tree or dependency graph format for syntactic structures matching a set of patterns in MPL, a regexp-like pattern language. Applications: information extraction, text mining.
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