掩码转换为正则表达式

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bool MatchCheck(string sn,string pattern)      {          return Regex.IsMatch(sn, pattern, RegexOptions.None);      }             /// <summary>      ///  掩码转换为正则表达式      /// </summary>      /// <param name="msk">掩码 CTH********F2GV**</param>      /// <param name="token">掩码符号* #</param>      /// <returns>regexp表达式</returns>      public static string MaskToRegex(string msk,string token)      {          if (string.IsNullOrEmpty(msk) || string.IsNullOrEmpty(token))              return string.Empty;          MatchCollection mac = Regex.Matches(msk, string.Format(@"\b(\w+)|([{0}]+)|\b",token));          string regex = string.Empty;          foreach (Match x in mac)          {              if (!string.IsNullOrEmpty(x.Value))              {                  if (Regex.IsMatch(x.Value, @"\w+"))                  {                      regex += x.Value;                                         }                  if (Regex.IsMatch(x.Value, string.Format(@"[{0}]+",token)))                  {                      string tempmsk = string.Format(@"\w{0}", "{" + x.Value.Length + "}");                                             regex += tempmsk;                  }              }          }                     string pattern = string.Format("^{0}$", regex);          return pattern;      }