Message157

Erronous handling of '(' for groupindex count:

Here the correct output of (C-)Python:
>>> re.compile(r'\\()(?P<x>)').groupindex
{'x': 2}
>>> re.compile(r'[()](?P<x>)').groupindex
{'x': 1}
>>> re.compile(r'[()](?P<x>)').groupindex
{'x': 1}
>>>

And here the buggy output of JPython:
>>> re.compile(r'\\()(?P<x>)').groupindex
{'x': 1}
>>> re.compile(r'[()](?P<x>)').groupindex
{'x': 2}
>>> re.compile(r'\\(?P<x>)').groupindex
Traceback (innermost last):
  File "<console>", line 1, in ?
re.error: Sequence (?P...) not recognized
>>>