title: RegExp for validating PRICE
body: <p>I am trying to validate a Price field:  </p>
  
  <p><strong>Should not allow</strong>:  </p>
  
  <ul>
  <li>white spaces  </li>
  <li>alphabets  </li>
  <li>negative values   </li>
  </ul>
  
  <p><strong>Should allow</strong>: </p>
  
  <ul>
  <li>numbers  </li>
  <li>commas  </li>
  <li>decimals</li>
  </ul>