title: extracting facebook page from html using regex
body: <p>I am trying to get the address of a facebook page of websites using regular expression search on the html</p>
  
  <p>usually the link appears as
   <code>&lt;a href="http://www.facebook.com/googlechrome"&gt;Facebook&lt;/a&gt;</code></p>
  
  <p>but sometimes the address will be <code>http://www.facebook.com/some.other</code></p>
  
  <p>and sometimes with numbers</p>
  
  <p>at the moment the regex that I have is </p>
  
  <pre><code>'(facebook.com)\S\w+'
  </code></pre>
  
  <p>but it won't catch the last 2 possibilites</p>
  
  <p>what is  it called when I want the regex to search but not fetch it? (for instance I want the regex to match the www.facbook.com part but not have that part in the result, only the part that comes after it</p>
  
  <p>note I use python with re and urllib2</p>