Hi,

I've come across some strings which I think aren't valid URLs that 
nevertheless pass validation by django.core.validators.URLValidator in 
Django 2.0.6 and 1.11.13. I know URL validation is very tricky, but these 
seemed to me that they should obviously fail.

http://#FOO#/b...@example.com

I believe that this is passing validation because "#FOO#/bar" is being 
treated as a username, with "example.com" as the hostname. However, 
"#FOO#/bar" shouldn't be valid as a username because the "#" and "/" 
characters aren't percent-encoded.

http://FOO/b...@example.com

Similarly, I think this passes validation not because "FOO" is being 
treated as a valid hostname, but because "FOO/bar" is considered a 
username, even though "/" isn't percent-encoded.

Should this be considered a bug? (Sure, it's pretty obscure, but this has 
actually come up in my particular use case.)

Thanks,

Tim Bell

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