public static string StripLeadingZeros(string sAlphaNumberText)
       {
           /*
            * That will trim trailing zeros if they appear after the period in a decimal number (it will always leave a single zero).
            *  It also accounts for numbers that appear at the very end.
            */
           string sRet = "";
 
           sRet = Regex.Replace(sAlphaNumberText,
                        @"(?<=\.\d+?)0+(?=\D|$)",
                        String.Empty);
           return sRet;
       }
 
       public static string StripWhitespace(string sAlphaNumberText)
       {
           /*
            * sStrip Whitespace
            */
           string sRet = "";
 
           sRet = Regex.Replace(sAlphaNumberText, @"\s+", "");
           return sRet;
       }
       public static string StripAllButNumbers(string sAlphaNumberText)
       {
           /*
            * strip all characters except numbers
            */
           string sRet = "";
 
           sRet = Regex.Replace(sAlphaNumberText, @"[^\d]", String.Empty);
           return sRet;
       }
       public static string StripNumbers(string sAlphaNumberText)
       {
           /*
            * sStrip Numbers
            */
           string sRet = "";
 
           sRet = Regex.Replace(sAlphaNumberText, @"[\d-]", string.Empty);
           return sRet;
       }
 
       public static string StripAllSpecialCharacters(string sAlphaNumberText)
       {
           /*
            * Strip All Special Characters
            */
           string sRet = "";
 
           sRet = Regex.Replace(sAlphaNumberText, "[^0-9a-zA-Z]+", "");
           return sRet;
       }

   private string[] GetCityStateZip(string sAddress)

        {

            //string[] split = sAddress.Split(new Char[] { ' ', });

            //return split;

            sAddress = sAddress.Replace(".", "");

            sAddress = sAddress.Replace(",", ", ");

            sAddress = sAddress.Replace("  ", " ");

            string[] aRet = new string[3];

            Regex addressPattern = new Regex(@"(?<city>[A-Za-z',.\s]+) (?<state>([A-Za-z]{2}|[A-Za-z]{2},))\s*(?<zip>\d{5}(-\d{4})|\d{5})");

            MatchCollection matches = addressPattern.Matches(sAddress);

            for (int mc = 0; mc < matches.Count; mc++)

            {

                aRet[pADDR_CITY] = matches[mc].Groups["city"].Value;

                aRet[pADDR_STATE] = matches[mc].Groups["state"].Value;

                aRet[pADDR_ZIP] = matches[mc].Groups["zip"].Value;

            }

            return aRet;

        }

Useage:   string[] CityStateZip = GetCityStateZip(cus.ADD3);
 

private string[] GetCityStateZip(string sAddress)
        {
            //string[] split = sAddress.Split(new Char[] { ' ', });
            //return split;
            sAddress = sAddress.Replace(".", "");
            sAddress = sAddress.Replace(",", ", ");
            sAddress = sAddress.Replace("  ", " ");
            string[] aRet = new string[3];
            Regex addressPattern = new Regex(@"(?<city>[A-Za-z',.\s]+) (?<state>([A-Za-z]{2}|[A-Za-z]{2},))\s*(?<zip>\d{5}(-\d{4})|\d{5})");
 
            MatchCollection matches = addressPattern.Matches(sAddress);
 
            for (int mc = 0; mc < matches.Count; mc++)
            {
                aRet[pADDR_CITY] = matches[mc].Groups["city"].Value;
                aRet[pADDR_STATE] = matches[mc].Groups["state"].Value;
                 aRet[pADDR_ZIP] = matches[mc].Groups["zip"].Value;
            }
            return aRet;
        }