title: FileUtils.iterateFiles IGNORECASE
body: <p>I need to find files in directories and subdirectories by type of extension and ignorecase mode, this is my code:</p>
  
  <pre><code>String[] patron = {"doc", "xls", "ppt"};
  Iterator iter =  FileUtils.iterateFiles(new File(directories), patron, true);
  </code></pre>
  
  <p>I also need to return the files with extension like Doc, Doc, ...  ignorecase</p>