Regex: Stripping Unwanted Chararcters

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;
       }