寻找匹配的Groups的几种方法示例：

 //
 // 两种大方法:
 //   MatchCollection<->Matches
 //   Match<->Match方式
 //
 // 第一大种：
 MatchCollection mMCollection =
  oRegex.Matches(strHTMLContent);
 if(mMCollection.Count > 1)
 {
  foreach(Match m in mMCollection)
  {
   Group ghiddentonecodes = m.Groups["hiddentonecodes"];
   strValue = ghiddentonecodes.Value;
  }
 }

 // 第二大种：
 // 这里面有两种方式：
 // 第2.1种：NextMacth方式
 Match mNext;
 int posn, length;
 for ( mNext = oRegex.Match( strHTMLContent ) ; mNext.Success ; mNext = mNext.NextMatch() )
 {
  foreach( Group g in mNext.Groups )
  {
   if( g.Length != 0 )
   {
    // Position of Capture object.
    posn = g.Index;
    // Length of Capture object.
    length = g.Length;
    strValue = g.Value;
   }
  }
 }
 //
 // 第2.2种：CaptureCollection方式
 String[] results = new String[20];
 // Loop through the match collection to retrieve all
 // matches and positions.
 Match mResult = oRegex.Match(strHTMLContent);
 if(false == mResult.Success)
 {
  m_strLastError =
   ("[ParseFile][解析HTML]错误描述:没有匹配到");
  return "";
 }
 CaptureCollection cc;
 foreach(Group g in mResult.Groups)
 {
  // Capture the Collection for Group(i).
  cc = g.Captures;
  for (int j = 0; j < cc.Count; j++)
  {
   // Position of Capture object.
   posn = cc[j].Index;
   // Length of Capture object.
   length = cc[j].Length;
   strValue = cc[j].Value;
  }
 }

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