[issue1519638] Unmatched Group issue - workaround

[Matthew Barnett]

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

The replacement can be a callable, so you could do this:

re.sub(r'(?:\((?:(\d+)|.*?)\)\s*)+$', lambda m: m.group(1) or '', 'avatar (special edition)')

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1519638>
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