title: XSLT - Filter single words from text
body: <p>I have string like below parsed by an XSLT</p>
  
  <pre><code>boy &amp;quot;happy family&amp;quot; filetype:pdf girl 
  </code></pre>
  
  <p>From the above string, I need to filter out only the single words "boy" and "girl" and get another string as </p>
  
  <pre><code>boy girl
  </code></pre>
  
  <p>How do I go about achieving this?</p>