On 25/11/2010 16:44, Yingjie Lan wrote:
--- On Thu, 11/25/10, MRAB<pyt...@mrabarnett.plus.com> wrote:
re.findall performs multiple searches, each starting where
the previous
one finished. The first match started at the start of the
string and
finished at its end. The second match started at that point
(the end of
the string) and found another match, ending at the end of
the string.
It tried to match a third time, but that failed because it
would have
matched an empty string again (it's not allowed to return 2
contiguous
empty strings).
Isn't this a bug?
No, but it can be confusing at times! :-)
--
But the last empty string is matched twice -- so it is
an overlapping. But findall is supposed not to return
overlapping matches. So I think this does not live up
to the documentation -- thus I still consider it a bug.
Look at the spans:
>>> for m in re.finditer('((.d.)*)*', 'adb'):
print(m.span())
(0, 3)
(3, 3)
There's an non-empty match followed by an empty match.
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