title: Checkstyle - Exclude folder
body: <p>I want to ignore a specific folder (named generated-sources) from my checkstyle reports, because they are generated.</p>
  
  <p>I'm using eclipse-cs for displaying my violations.</p>
  
  <p>i added a suppressionfilter to my xml:</p>
  
  <pre><code>&lt;module name="SuppressionFilter"&gt;
      &lt;property name="file" value=".\suppressions.xml"/&gt;
  &lt;/module&gt;
  </code></pre>
  
  <p>my suppressions.xml looks like this:</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  
  &lt;!DOCTYPE suppressions PUBLIC
  "-//Puppy Crawl//DTD Suppressions 1.1//EN"
  "http://www.puppycrawl.com/dtds/suppressions_1_1.dtd"&gt;
  
  &lt;suppressions&gt;
      &lt;suppress files="\*generated-sources\*\*\.\*" checks="[a-zA-Z0-9]*"/&gt;
  &lt;/suppressions&gt;
  </code></pre>
  
  <p>but it is not working. any ideas?</p>