swift - if statement for random string and int

i have this if statement worked well but the code: DqJUXRcx may changed so, how to make it == random code ?

    @IBAction func btnPlusPressed(_ sender: UIButton)
{
        var strURLl = url.text!

        if (url.text == "DqJUXRcx" as String ){
                strURLl = "https://pastebin.com/raw/\(url.text!)"
            } else {
                strURLl = "\(url.text!)"
            }
}