Matthew Barnett <[email protected]> added the comment:
Even if this bug is fixed, it still won't work as you expect, and this s why.
The Scanner function accepts a list of 2-tuples. The first item of the tuple is
a regex and the second is a function. For example:
re.Scanner([(r"\d+", number), (r"\w+", word)])
The Scanner function then builds a regex, using the given regexes as
alternatives, each wrapped as a capture group:
r"(\d+)|(\w+)"
When matching, it sees which group captured and uses that to decide which
function it should call, so, for example, if group 1 matched, it calls
"number", and if group 2 matched, it calls "word".
When you introduce capture groups into the regexes, it gets confused. If your
regex matches, it'll see that groups 1 and 2 match, so it'll try to call the
second function, but there's isn't one...
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Python tracker <[email protected]>
<http://bugs.python.org/issue12789>
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