Serhiy Storchaka added the comment:

Originally the catch condition was (lo == 0). It was changed in changeset 
41c42b1bd582.

> Offhand, do you have an example that displays bad behavior in 2.7?  I'm 
> curious because I didn't find one after half an hour of trying.

re.match('(?:.?.?)*y', 'x'*20)

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<http://bugs.python.org/issue18647>
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