title: Regular Expression for password
body: <p>I'm not really good at regular expressions. I need to do the following to validate if a password, entered by the user, is correct or not.</p>
  
  <p>Criteria:</p>
  
  <ol>
  <li>Must contain at least one number</li>
  <li>Must contain at least one letter from A-Z or a-z (case does not matter as long as they enter is a letter).</li>
  <li>The password must be a minimum of 8 characters</li>
  </ol>