java 验证邮箱格式正确性

public class RegisterCheck {
    /**
     * 验证输入的邮箱格式是否符合
     * @param email
     * @return 是否合法
     */
public static boolean emailFormat(String email)
    {
        boolean tag = true;
        final String pattern1 = "^([a-z0-9A-Z]+[-|//.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?//.)+[a-zA-Z]{2,}$";
        final Pattern pattern = (pattern1);
        final Matcher mat = (email);
        if (!()) {
            tag = false;
        }
        return tag;
    }
}