title: how to extract date from a string using regex
body: <p>i m looking for regex which can extract the date from the following html</p>
  
  <pre><code>&lt;p&gt;British Medical Journal, 29.9.12, pp.37-41.&lt;/p&gt;
  </code></pre>
  
  <p>and convert it in the format 29/09/12 </p>