Thanks for the link, it's a fascinating read (again).
some things most be noted
- MJD is restricting himself to a (very powerful) subset of possible regexes.
E.g. he's neither covering look ahead, look behind nor embedded Perl.
- He doesn't cover the question of how to translate a regex to his stream representation.
BUT fascinating enough he shows later that he can produce a sorted output: first by length and second lexicographic.
That means one could probably create a "pragmatic" comparison of two streams, i.e. comparing the leading substrings of all solutions up to a certain length and quickly identifying "incompatible" regexes...
If there is still an overlap possible after n characters one could reject a regex for being too "similar" (potentially compatible).
Well theoretically, I won't try to implement this. .. :)
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