[issue12759] "(?P=)" input for Tools/scripts/redemo.py raises unnhandled exception

[Masha Katsman]

Masha Katsman <mkatsman at yahoo.com> added the comment:

Updating the patch with the test. The test checks that the re exception is thrown in case of the (?P=) and (?P<>) expressions.
It used to raise an Index exception. My only question is, the exception we raise now says, there invalid characters in the group name, whether in our case the group name is just empty.

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Added file: http://bugs.python.org/file23769/patch_for_12759

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