[issue2636] Regexp 2.7 (modifications to current re 2.2.2)

[Matthew Barnett]

Matthew Barnett <python at mrabarnett.plus.com> added the comment:

Further to msg74203, I can see no reason why we can't allow duplicate
capture group names if the groups are on different branches are are thus
mutually exclusive. For example:

    (?P<name>a)|(?P<name>b)

Apart from this I think that duplicate names should continue to raise an
exception.

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