id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
18517	URLField does not support url with underscore	guoqiao	nobody	"if your url has a '_' in it, like this:
 * http://django_compressor.readthedocs.org/
the URLField will complain that it is not a valid url. the problem lies in the '_' symbol. I find in the source code as Following:
{{{
class URLValidator(RegexValidator):
    regex = re.compile(
        r'^(?:http|ftp)s?://' # http:// or https://
        r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|' #domain...
        r'localhost|' #localhost...
        r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})' # ...or ip
        r'(?::\d+)?' # optional port
        r'(?:/?|[/?]\S+)$', re.IGNORECASE)
}}}

the related part is this line:
{{{
r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|'
}}}

It's clear that '_' is not included in the pattern. 
I think this is not reaonable for there's a lot of url has a '_' in it.
"	Bug	closed	Core (URLs)	1.6	Normal	wontfix	URLFiled	guoqiao	Unreviewed	0	0	0	0	1	0