var email = " hogehoge@example.com \n";
var localpart = "";
var domainpart = "";
email = email.trim();
var matches = email.match(/^(.*?)@(.+)$/);
if (matches && matches.length === 3) {
localpart = matches[1];
domainpart = matches[2];
}
alert("email=" + email + ", localpart=" + localpart + ", domainpart=" + domainpart);