[issue1647489] zero-length match confuses re.finditer()

[Matthew Barnett]

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

What should:

    [m.groups() for m in re.finditer(r'(^z*)|(^q*)|(\w+)', 'abc')]

return? Should the second group also yield a zero-width match before the
third group is tried? I think it probably should. Does Perl?

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