title: Regular expression to search for a specific string along with unknowns
body: <p>Im attepting to find the regex to pull the</p>
  
  <pre><code> http://{any_string}.blogspot.com/feeds/{any_string}/comments/default
  </code></pre>
  
  <p>out of</p>
  
  <pre><code> &lt;link rel="alternate"
   type="application/atom+xml"
   title="{any_string}"
   href="http://{any_string}.blogspot.com/feeds/{any_string}/comments/default"
   /&gt;
  </code></pre>
  
  <p>I know basics of regex and using eregi but im unsure of how to include constant characters such as the http://, etc in the regex expression!</p>
  
  <p>Thanks!</p>