c#通用代码

/// <summary>  
        /// 替换手机号中间四位为*  
        /// </summary>  
        /// <param name="phoneNo"></param>  
        /// <returns></returns>  
        protected static string ReturnPhoneNO(string phoneNo)
        {
            Regex re = new Regex(@"(\d{3})(\d{4})(\d{4})", RegexOptions.None);
            phoneNo = re.Replace(phoneNo, "$1****$3");
            return phoneNo;
        }

        /// <summary> 
        /// 替换邮箱中间几位为*号  
        /// </summary>  
        /// <param name="Email"></param>  
        /// <returns></returns>  
        protected static string ReturnEmail(string Email)
        {
            Regex re = new Regex(@"\w{3}(?=@\w+?.\S+)", RegexOptions.None);
            Email = re.Replace(Email, "****");
            return Email;
        }