title: preg_match regex match more than 4 digits
body: <p>I have $input which contains:</p>
  <pre><code>&lt;a href=&quot;http://digitalocean.com/info/hello-23-kitty-show-1-d-zay-ya-9013294119&quot; title=&quot;Hello Kitty  (Show &amp;amp; Zay Ya&quot; style=&quot;font-size:medium;&quot; target=&quot;_blank&quot; class=&quot;highlight-item&quot;&gt;
  </code></pre>
  <p>I need to preg_match only those last digits in href url (9013294119). Those digits can be longer or shorter sometimes as URL's in $input varies ( but its always minimum 4 characters length).</p>
  <p>I tried following regex expression but no luck as my regex experience is very limited:</p>
  <pre><code>preg_match('/^[0-9+]$/', $input, $output);
  </code></pre>
  <p>Any help?</p>