title: Regex to match nothing but zeroes after the first zero
body: <p>Using regular expressions, how can I make sure there are nothing but zeroes after the first zero?</p>
  <pre><code>ABC1000000 - valid
  3212130000 - valid
  0000000000 - valid
  ABC1000100 - invalid
  0001000000 - invalid
  </code></pre>
  <p>The regex without validation would be something like this - <code>[A-Z0-9]{10}</code>, making sure it is 10 characters.</p>