function wp_iso_descrambler( $string ) {
	/* this may only work with iso-8859-1, I'm afraid */
	if ( ! preg_match( '#\=\?(.+)\?Q\?(.+)\?\=#i', $string, $matches ) ) {
		return $string;
	} else {
		$subject = str_replace( '_', ' ', $matches[2] );
		return preg_replace_callback( '#\=([0-9a-f]{2})#i', '_wp_iso_convert', $subject );
	}
}