> paul prescod spotted this discrepancy:
>
> from the documentation:
>
> start ([group])
> end ([group])
> Return the indices of the start and end of the
> substring matched by group; group defaults to
> zero (meaning the whole matched substring). Return
> None if group exists but did not contribute to the
> match.
>
> however, it turns out that PCRE doesn't do what it's
> supposed to:
>
> >>> import pre
> >>> m = pre.match("(a)|(b)", "b")
> >>> m.start(1)
> -1
>
> unlike SRE:
>
> >>> import sre
> >>> m = sre.match("(a)|(b)", "b")
> >>> m.start(1)
> >>> print m.start(1)
> None
>
> this difference breaks 1.6's pyclbr (1.5.2's pyclbr works
> just fine with SRE, though...)
>
> :::
>
> should I fix SRE and ask Fred to fix the docs, or should
> someone fix pyclbr and maybe even PCRE?
I'd suggest fix SRE and the docs, because -1 is a more useful
indicator for "no match" than None: it has the same type as valid
indices. It makes it easier to adapt to static typing later.
--Guido van Rossum (home page: http://www.pythonlabs.com/~guido/)
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