David Reitter writes:
> Why does the following result in an IndexError?
[...]
> >>> import re
> >>> m = re.match('(?P<m>maybe)?yes', "yes")
> >>> m.group(1)
> >>> m.group('maybe')
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> IndexError: no such group
Because the name of the named group in your example is 'm' not 'maybe'. 'maybe'
is the text to match. Try it like this:
>>> import re
>>> m = re.match('(?P<m>maybe)?yes', "yes")
>>> print m.group(1)
None
>>> print m.group('m')
None
-- Michael Chermside
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