title: Regex for password: Must start with a capital letter and contain only one digit
body: <p>I need something like this:</p>
  <ul>
  <li>starts with a capital letter</li>
  <li>only one digit (positive integer) that can be in any place in the string</li>
  <li>other characters allowed are alphabets</li>
  <li>for example: <code>Jack3</code> or <code>J3ack</code> or <code>Ablabla5blabla</code> or <code>Adam5</code> or <code>A4dam</code> or <code>Ad4am</code></li>
  </ul>
  <p>I've come this far: <code>/^[A-Z]</code></p>