Form validation url-check

[eluser]moodh[/eluser]
[quote author="kirrie" date="1227757124"]check this out.

in system/application/config/config.php

Code:

$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-';

[/quote]

Please read my post again, just because CI protects against bad url's doesn't mean form_validation protects user-inputed url, which is what I'm asking about. =)

[quote author="manilodisan" date="1227764622"]We use this one

Code:

function valid_url($str)
{
    return ( ! preg_match('/^(http|https|ftp):\/\/([A-Z0-9][A-Z0-9_-]*(?:\.[A-Z0-9][A-Z0-9_-]*)+):?(\d+)?\/?/i', $str)) ? FALSE : TRUE;
}

[/quote]

As a callback I guess? or did you extend the library (form_validation)?