相关疑难解决方法(0)

我使用此表达式时收到错误消息:

re.sub(r"([^\s\w])(\s*\1)+","\\1","...")

我在RegExr检查了正则表达式,它.按预期返回.但是当我在Python中尝试它时,我收到此错误消息:

raise error, v # invalid expression
sre_constants.error: nothing to repeat

有人可以解释一下吗？

我正在将C#函数转换为Python.对于与存在功能兼容的bug应该是bug.

这是该函数的正则表达式:http://[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+([-A-Z0-9a-z_$.+!*()/\\\,:;@&=?~#%]*)*.但Python无法编译它:

>>> re.compile(r"http://[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+([-A-Z0-9a-z_$.+!*()/\\\,:;@&=?~#%]*)*")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.3/re.py", line 214, in compile
    return _compile(pattern, flags)
  File "/usr/lib/python3.3/re.py", line 281, in _compile
    p = sre_compile.compile(pattern, flags)
  File "/usr/lib/python3.3/sre_compile.py", line 498, in compile
    code = _code(p, flags)
  File "/usr/lib/python3.3/sre_compile.py", line 483, in _code
    _compile(code, p.data, flags)
  File "/usr/lib/python3.3/sre_compile.py", line 75, in _compile
    elif _simple(av) and op is not REPEAT:
  File "/usr/lib/python3.3/sre_compile.py", line 362, in _simple
    raise error("nothing to repeat")
sre_constants.error: nothing …