title: Regular expression to read n number of count
body: <p>I am having one html document which have lots of PO number .</p>
  
  <p>I am trying to retrieve. I am not good with regular expression. I am able to find with first no with by position. but i need all of them. how to do that.</p>
  
  <p>my Html file look like </p>
  
  <pre><code>&lt;html&gt;
   &lt;head&gt;&lt;/head&gt;
  &lt;body&gt;
  &lt;br&gt;
  Invoice Number : [12346456] PO Number : [6464645]
  
  &lt;hr&gt;
  Invoice Number : [90156460] PO Number : [6416462]
  
  &lt;hr&gt;
  Invoice Number : [90868741] PO Number : [1613464]
  
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>My code </p>
  
  <pre><code>po_count = page.css('body').text.scan(/\d+/)[1].to_i
  </code></pre>
  
  <p>In which i am getting first <code>PO Number 6464645</code>
  I need all PO Number</p>