title: just last digits in string by regex
body: <p>I have difficulty with regex. My goal is to retrieve the last and only last numbers in the string if exists.</p>
  
  <ul>
  <li>temp-15 - return 15</li>
  <li>temp14t - return nothing</li>
  <li>temp12temp13 - return 13</li>
  <li>1412315235temp?1 - return 1</li>
  <li>temp-14t# - return nothing</li>
  </ul>