邮件格式校验及字符长度校验

private static final String MAIL_REGEX = "^([a-z0-9A-Z]+[_|-|\\.]?)+[a-z0-9A-Z]@"
                +"([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
   
    private static final String PUSH_TOKEN_REGEX = "^([a-z0-9A-Z]{64})$";
   
    private static final int MAIL_LENGTH = 98;
   
    /**
     * Description:邮件格式校验
     *
     * @author qiaowang
     * @param mail
     * @return boolean
     */
    public static boolean checkMail(String mail) {

        if (mail == null) {
            throw new NullPointerException("mail is null");
        }
        if(mail.length() > MAIL_LENGTH){
            return Boolean.FALSE;
        }
       
        Pattern regex = Pattern.compile(MAIL_REGEX);
        Matcher matcher = regex.matcher(mail);
        return matcher.matches();
    }
   
    public static boolean checkPushToken(String pushToken) {

        if (pushToken == null) {
            throw new NullPointerException("push token is null");
        }

        Pattern regex = Pattern.compile(PUSH_TOKEN_REGEX);
        Matcher matcher = regex.matcher(pushToken);
        return matcher.matches();
    }