Hendrik Lemelson added the comment:
Thank you for clarifying this. While it still not seems really intuitive to me
I can handle the behavior.
To summarize: It is not possible with re to have an optional ({0,1}) group that
contains further subgroups, because re considers (0,0) to already fulfill the
constraints for the outer group?
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resolution: -> invalid
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17257>
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