title: Regular Expression extract in apache pig
body: <p>I have data like</p>
  
  <pre><code>A8
  SS4
  M9
  </code></pre>
  
  <p>I need to extract all alphabets from this data using </p>
  
  <pre><code>REGEX_EXTRACT
  </code></pre>
  
  <p>My Pig Statement is as below</p>
  
  <pre><code>A = load 'data';
  B = foreach A generate REGEX_EXTRACT($0,'\\*[^0-9]',1);
  dump B;
  </code></pre>
  
  <p>however I get null as my output.</p>