per l'email
codice:
function checkMail( $m ) {
	// andr3a / HTML.IT / caruccis
	$r1 = "([a-z0-9]+[";
	$r2 = "\-]?){1,3}([a-z0-9])*";
	return preg_match("/(?i)^{$r1}\._{$r2}\@{$r1}{$r2}\.[a-z]{2,6}$/", $m);
}