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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is an updated patch. More appropriate error message used, many new tests added.

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keywords: +patch
stage: needs patch -> patch review
versions: +Python 3.4
Added file: http://bugs.python.org/file27831/sre_empty_group_name.patch

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