title: Regex to match after specific characters
body: <pre><code>var str = "=IIF(IsNothing(Fields!Metadata1.Value),"N/A",Fields!Metadata1.Value)";
  var regexp = new Regex(@"Fields!(\w+)");
  var matches = regexp.Matches(str);
  </code></pre>
  
  <p>The matches will have "Fields!Metadata1"
  while I need to get "Metadata1"</p>
  
  <p>What shall I change? </p>