Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment:
Should a regex compile if a group is referenced before it's defined?
Consider this:
(?:(?(2)(a)|(b))+
Other regex implementations permit forward references to groups.
BTW, I had a look at the re module, found it too difficult, and so started on
my own implementation of the matching engine (available on PyPI).
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<http://bugs.python.org/issue9179>
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