Form validation url-check

[eluser]moodh[/eluser]
I just looked through the library, and noticed there's no valid_url method, which in itself is completly fine, I'll just use a regexp check, however:

I then noticed a line in the language files related to form validation, where there indeed exist a line related to url-checking, so how is it, is there an url-check or not? =p

I don't know whether this is a bug or not, so I posted it here. =)