title: simple preg_match needed
body: <p>The conditions of the preg_match are:</p>
  
  <ol>
  <li>can only contain letters (upper or lower case) and numbers</li>
  <li>must begin with a letter</li>
  </ol>
  
  <p>Here is what I have at the moment:</p>
  
  <pre><code>/^[a-zA-Z0-9]+$/
  </code></pre>
  
  <p>This works for the first condition but not the second.</p>