title: Using Regex to parse browser-version from User-Agent-Header
body: <p>Parsing the user-agent header I need to find out if I am dealing with IE-8 or earlier:  </p>
  
  <pre><code>&lt;= IE8
  </code></pre>
  
  <p>So the regex should return true in the following cases:</p>
  
  <pre><code>(compatible; MSIE 8.0;...)
  (compatible; MSIE 7.0;...)
  etc. 
  </code></pre>
  
  <p>The following should yield false:</p>
  
  <pre><code>(compatible; MSIE 9.0;...)
  </code></pre>
  
  <p>This following regex does not work:   </p>
  
  <pre><code>"MSIE [6-8]\."
  </code></pre>