URLValidator raising sre_constants.error

When entering two backslashes into the URL validator it raises an `sre_constants.error`. As per the docs, it seems like the validator should catch this and then chain a `ValidationError` to the exception. This appears to be an issue with Django's integration with Python's regex implementation. This may just be my misunderstanding of the way Django handles validation, but it seems like any form of invalid input should raise a `ValidationError`.

I found this while running Django 1.6.2 on Python 3.3.0 on Windows 7.

This session reproduces the bug on my system.

>>> from django.core.validators import URLValidator

>>> URLValidator('\\')

Traceback (most recent call last):

  File "C:\Python33\lib\sre_parse.py", line 195, in __next

    c = self.string[self.index + 1]

IndexError: string index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "<string>", line 301, in runcode

  File "<interactive input>", line 1, in <module>

  File "C:\Python33\lib\site-packages\django\core\validators.py", line 32, in __init__

    self.regex = re.compile(self.regex)

  File "C:\Python33\lib\re.py", line 214, in compile

    return _compile(pattern, flags)

  File "C:\Python33\lib\functools.py", line 258, in wrapper

    result = user_function(*args, **kwds)

  File "C:\Python33\lib\re.py", line 274, in _compile

    return sre_compile.compile(pattern, flags)

  File "C:\Python33\lib\sre_compile.py", line 493, in compile

    p = sre_parse.parse(p, flags)

  File "C:\Python33\lib\sre_parse.py", line 717, in parse

    source = Tokenizer(str)

  File "C:\Python33\lib\sre_parse.py", line 183, in __init__

    self.__next()

  File "C:\Python33\lib\sre_parse.py", line 197, in __next

    raise error("bogus escape (end of line)")

sre_constants.error: bogus escape (end of line)

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