copia e incolla

codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

<script type="text/javascript">
// <![CDATA[
function cprovincia() {

    var provincia = document.getElementById('prov');

    if (!(/^([\w\-\s]+?)\s\([A-Z]{2}\)$/).test(provincia.value)) {
        alert('formato provincia non corretto');
        return false;
    }

    alert('provincia correttamente inserita');
    return true;

}
// ]]>
</script>
</head>

<body>
    <form onsubmit="return cprovincia()">
        <input type="text" name="prov" id="prov" value="Medio Campidano (MC)" />
        <input type="submit" id="submit" value="invia"/>
    </form>
</body>
</html>