http://yahoo.co.uk/notfound.html                   => yahoo.co.uk
http://yahoo.co.uk:80/notfound.html?fn=john&ln=doe => yahoo.co.uk
http://yahoo.co.uk/                                => yahoo.co.uk
http://yahoo.co.uk                                 => yahoo.co.uk
yahoo.co.uk/notfound.html                          => No match
yahoo.co.uk                                        => No match
potato://yahoo.co.uk                               => No match

http://yahoo.co.uk:80/notfound.html?fn=john&ln=doe =>
    http
    yahoo.co.uk
    80
    /notfound.html?fn=john&ln=doe
    notfound.html?fn=john&ln=doe
    notfound.html
    fn=john&ln=doe