title: SCOM doesn't recognize Regex pattern
body: <p>The following Regexp works to match Error 403 with the numbers in range 40-49:</p>
  
  <pre><code>HTTP\/[\d.]+.\s+(?:403)\s+(4[0-9])\s+
  
  sometext HTTP/1.1" 403 46 "-" "sometext" -&gt;match
  sometext HTTP/1.1" 403 56 "-" "sometext" -&gt; no match
  sometext HTTP/1.1" 403 460 "-" "sometext" -&gt; no match
  </code></pre>
  
  <p>Now I set this expression in SCOM to monitor a nginx logfile but </p>
  
  <pre><code>/var/opt/microsoft/scx/log/scx.log
  </code></pre>
  
  <p>complains about </p>
  
  <pre><code>SCXLogFileProvider DoInvokeMethod - invalid regexp : HTTP\/[\d.]+.\s+(?:403)\s+(4[0-9])\s+
  </code></pre>
  
  <p>What can be the reason for that?</p>