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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