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When I run this code:
print re.search(r'1', '1').groups()
I get a result of (). However, .group(0) gives me the match.
Shouldn’t groups() give me something containing the match?
groups is empty since you do not have any capturing groups – http://docs.python.org/library/re.html#re.MatchObject.groups. group(0) will always returns the whole text that was matched regardless of if it was captured in a group or not
Edited.