[docs] [issue14462] In re's named group the name cannot contain unicode characters

[py.user]

New submission from py.user <port139 at yandex.ru>:

http://docs.python.org/py3k/library/re.html
"(?P<name>...)

    Similar to regular parentheses, but the substring matched by the group is accessible within the rest of the regular expression via the symbolic group name name. Group names must be valid Python identifiers, and each group name must be defined only once within a regular expression."


>>> chr(255)
'ÿ'
>>> 'ÿ'.isidentifier()
True
>>> import re
>>> re.search(r'(?P<ÿ>a)', 'abc')
Traceback (most recent call last):
  File "/usr/local/lib/python3.2/functools.py", line 176, in wrapper
    result = cache[key]
KeyError: (<class 'str'>, '(?P<ÿ>a)', 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.2/re.py", line 158, in search
    return _compile(pattern, flags).search(string)
  File "/usr/local/lib/python3.2/re.py", line 255, in _compile
    return _compile_typed(type(pattern), pattern, flags)
  File "/usr/local/lib/python3.2/functools.py", line 180, in wrapper
    result = user_function(*args, **kwds)
  File "/usr/local/lib/python3.2/re.py", line 267, in _compile_typed
    return sre_compile.compile(pattern, flags)
  File "/usr/local/lib/python3.2/sre_compile.py", line 491, in compile
    p = sre_parse.parse(p, flags)
  File "/usr/local/lib/python3.2/sre_parse.py", line 692, in parse
    p = _parse_sub(source, pattern, 0)
  File "/usr/local/lib/python3.2/sre_parse.py", line 315, in _parse_sub
    itemsappend(_parse(source, state))
  File "/usr/local/lib/python3.2/sre_parse.py", line 552, in _parse
    raise error("bad character in group name")
sre_constants.error: bad character in group name
>>>


also:
(?P=name)
(?(name)yes|no)
\g<name>

----------
assignee: docs at python
components: Documentation, Regular Expressions
messages: 157266
nosy: docs at python, ezio.melotti, mrabarnett, py.user
priority: normal
severity: normal
status: open
title: In re's named group the name cannot contain unicode characters
type: behavior
versions: Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14462>
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