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<td class="balkenL"><div style="width:16px;background-color:#D30029;"> </div></td>
<td class="wertL"><span>107,35</span></td>
<td class="wertCaption">Fehlpässe</td>
<td class="wertR">104,82</td>
<td class="balkenR"><div style="width:16px;background-color:#C2BFBF;"> </div></td>                    

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var rx = new Regex(@"<td class=""wertCaption"">(.*?)</td>");
var m = rx.Match(textBox1.Text);
if (m.Success)
  MessageBox.Show(m.Groups[1].ToString());                    

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<td.*?class="wertCaption".*?>(?<value>[^<]*)                    

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WebClient web = new WebClient();
string htmlCode = web.DownloadString(url);

string pattern = @"<td.*?class=""wertCaption"".*?>(?<value>[^<]*)";
Regex rx1 = new Regex(pattern);
var m = rx1.Matches(htmlCode);

if (m.Success)
{
    Console.WriteLine(m.Groups[1].ToString());
}
Console.ReadLine();                    

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WebClient web = new WebClient();
string htmlCode = web.DownloadString(url);
string pattern = @"<td.*?class=""wertCaption"".*?>(?<value>[^<]*)";

Regex rx1 = new Regex(pattern);
MatchCollection matches = rx1.Matches(htmlCode);
foreach (Match match in matches)
{
foreach (Capture capture in match.Captures)
{
Console.WriteLine(capture.Value);
}
}
Console.ReadLine();