title: regex number OR period
body: <p>I am having a problem with a regex.  I am trying to find the combination of a Letter and digit/period/hyphen.  So it will always start with a capital letter, followed by either a digit, period or hyphen, followed by a space.  So all of these should work</p>
  
  <ul>
  <li><code>D7</code></li>
  <li><code>A.</code></li>
  <li><code>H-</code></li>
  </ul>
  
  <p>But these shouldn't </p>
  
  <ul>
  <li><code>GJ</code></li>
  <li><code>G6.</code> (No space after the second param)</li>
  </ul>
  
  <p>At the moment I am trying this without success</p>
  
  <pre><code>[A-Z]{1}\d{1}|\.\s
  </code></pre>