title: find specific file extension with find command
body: <p>I would like to find any files within a given root that contain arbitrary extensions in the filename.
  I saw this post:
  <a href="https://stackoverflow.com/questions/6839966/how-to-delete-all-files-with-certain-suffix-before-file-extension">How to delete all files with certain suffix before file extension</a></p>
  
  <p>Based on that information, I tried this:</p>
  
  <pre><code>find . -iregex ".*\.\(wav\|aif\|wave\|aiff\)"
  </code></pre>
  
  <p>This seems like it <em>should</em> work, but I don't get any results printed to the terminal window.</p>
  
  <p>Can anyone offer advice?  I'm on OSX 10.7</p>
  
  <p>Thanks,
  jml</p>