Nice suggestion and thanks for the compliment! The inspiration for this work is the Regexp::Genex module from CPAN: http://search.cpan.org/dist/Regexp-Genex/ h

Nice suggestion and thanks for the compliment! The inspiration for this work is the Regexp::Genex module from CPAN: http://search.cpan.org/dist/Regexp-Genex/ http://search.cpan.org/dist/Regexp-Genex/ -- though it uses a random-walk approach for character classes, instead of enumerating all possibilities. regex-tdfa was only really used for parsing regexes, so it's certainly possible to find duplicates. That said, piping the output to "|perl -pe 's/.*\t//' | sort | uniq -d" is quite usable too. :-)