浅谈C#手机号换成111XXXX1111 这种显示的解决思路

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