Pommo_Helper::isEmailS PHP Method

    function isEmailS($value)
    {
        // in case value is several addresses separated by newlines
        $_addresses = preg_split('![\\n\\r]+!', $value);
        foreach ($_addresses as $_address) {
            $_is_valid = !(preg_match('!@.*@|\\.\\.|\\,|\\;!', $_address) || !preg_match('!^.+\\@(\\[?)[a-zA-Z0-9\\.\\-]+\\.([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$!', $_address));
            if (!$_is_valid) {
                return false;
            }
        }
        return true;
    }