title: Need a regular expression - disallow all zeros
body: <p>I want to validate a string to meet the following conditions:</p>
  
  <ul>
  <li>Must be 6 characters long</li>
  <li>Only the first character can be alpha-numeric the rest must be numeric</li>
  <li>If first digit is alpha, it must be caps</li>
  <li>Can't be all zeros</li>
  </ul>
  
  <p>I have the following regular expression that gets everything except the all zeros part.  Is there a way to disallow all zeros?</p>
  
  <p><code>^[A-Z0-9][0-9]{5}$</code></p>
  
  <p>Is the only way to do this to check the regex (and allow "000000") but then check specifically that it's not "000000"?</p>
  
  <p>Thanks.</p>