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I noticed recently that the lastindex attribute of match objects 
is now documented, so I believe that the lastindex problem I 
described in my March 8 posting needs to be fixed.  Simply, 
lastindex may claim that a group matched when in fact it 
didn't (because lastindex does not get updated when 
lastmark is reset to a lower value):

>>> m = sre.match('(\d)?\d\d', '12')
>>> m.groups()
(None,)
>>> m.lastindex
1