判断邮箱帐号

//邮箱校验
public static function isEmail($email) {
    $pattern = '/^([a-z0-9]*[-_]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[\.][a-z]{2,3}([\.][a-z]{2})?$/i';
    return !!preg_match($pattern, $email);
}