title: Regular Expression for a range >= 0 but less than 1000
body: <p>I am busy working on this and thought I would put it our there. </p>
  
  <p>It must be a number with a maximum of 3 units and maximum of 5 decimal places etc</p>
  
  <p>Valid</p>
  
  <ul>
  <li>999.99999</li>
  <li>99.9</li>
  <li>9</li>
  <li>0.99999</li>
  <li>0</li>
  </ul>
  
  <p>Invalid</p>
  
  <ul>
  <li>-0.1</li>
  <li>999.123456</li>
  <li>AAA</li>
  <li>AAA.99999</li>
  </ul>
  
  <p><strong>EDIT</strong> It needs to be greater than or equal to zero. </p>