正则表达式数据验证

       // 判断是否为邮编
        public static bool IsPostalcode(string strPostcode)
        {
            if (strPostcode == null) return false;
            else return Regex.IsMatch(strPostcode, @"^\d{6}$");
        }

/// <summary>
        /// 判断邮箱是否有效
        /// </summary>
        /// <param name="cardNum">邮箱地址</param>
        /// <returns></returns>
        public static bool CheckCardMail(string cardNum)
        {
            var cardExp = new Regex(@"^[a-z0-9_\-]+(\.[_a-z0-9\-]+)*@([_a-z0-9\-]+\.)+([a-z]{2}|aero|arpa|biz|com|coop|edu|gov|info|int|jobs|mil|museum|name|nato|net|org|pro|travel)$");

            return cardExp.Match(cardNum).Success;
        }