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Derivative-Based Diagnosis of Regular Expression Ambiguity

Regular expressions are often ambiguous. We present a novel method based on Brzozowski's derivatives to aid the user in diagnosing ambiguous regular expressions. We introduce a derivative-based finite state transducer to generate parse trees and minimal counter-examples. The transducer can be easily customized to either follow the POSIX or Greedy disambiguation policy and based on a finite set of examples it is possible to examine if there are any differences among POSIX and Greedy.

preprint2016arXivOpen access
Martin SulzmannKenny Zhuo Ming Lu
Formal Languages and Automata Theory
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Martin SulzmannKenny Zhuo Ming Lu

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