title: How to exclude multiple domains using W3C's Checklink
body: <p>The <code>checklink</code> command supports an --exclude parameter, which accepts a regex. Example:</p>
  
  <pre><code>checklink --exclude foo\.com/.* http://example.com
  </code></pre>
  
  <p>Alas, example.com links to multiple sites, many of which use robots.txt to block checklink, and thus I get many link-not-checked messages in the output.</p>
  
  <p>I've excluded foo.com as above. How can I exclude multiple domains? If I have multiple --exclude parameters, only the last one is honoured.</p>
  
  <p><code>checklink --version</code> gives "W3C Link Checker version 4.81 (c) 1999-2011 W3C"; <code>aptitude show w3c-linkchecker</code> gives "version 4.81-9"; I'm on Debian Stable.</p>