auto link?

Værsgo:

    function url2link($txt)
    {
        $username = "[a-z0-9_\-]+";
        $password = "[a-z0-9_\-!#]+";
        $host = "[a-z0-9\-]+\.[a-z0-9\-\.]+";
        $port = "\d{1,5}";
        $path = "\/[a-z0-9\/\-\.\(\)\%]*";
        $querystr = "\?[a-z0-9&=\-\.%\(\)]+";
        $proto = "(https?|ftp):\/\/";
        $url = "$host(:$port)?($path($querystr)?)?";
        $protodomain = "/$proto(($username(:$password)?@)?$url)/i";
        $domain = "/(^| )(www\.$url)/im";
        $protomail = "/mailto:($username@$host)/i";
        $mail = "/(^| )($username@$host)/im";
        $replacements = array(
                $protodomain => "<a href=\"\\0\" target=\"_blank\">\\2</a>"
                ,$domain => "\\1<a href=\"http://\\2\" target=\"_blank\">\\2</a>"
                ,$protomail => "<a href=\"\\0\">\\1</a>"
                ,$mail => "\\1<a href=\"mailto:\\2\">\\2</a>"
            );
        return preg_replace( array_keys( $replacements ), array_values( $replacements ), $txt );
    }

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