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

[Masha Katsman]

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

The problem with the above expression is that it does not specify a group name. The expression itself is not right. So, it blows up when it tries to parse the name. I put the check for the empty name before any processing is done.

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Added file: http://bugs.python.org/file23751/patch_for_12759

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