title: Using regex need to add string at begining of the result
body: <p>I need to add string using regex at beginning of result. My working regex is:</p>
  
  <pre><code>&lt;img id="main-image" src="(.*?)"
  </code></pre>
  
  <p>and their result is:</p>
  
  <pre><code>/images/product/400x400/662/662544_400x400.jpg
  </code></pre>
  
  <p>I am trying to add <em>www.xyz.com</em> at beginning of the result using regex 
  so that actual result would be like this.</p>
  
  <pre><code>www.xyz.com/images/product/400x400/662/662544_400x400.jpg
  </code></pre>
  
  <p>For parsing the regex I am using Java UDF and pig</p>
  
  <p>Is there any way to do this, please advise.</p>