title: Get string between two strings
body: <p>My string is: "reply-234-private", i want to get the number after "reply-" and before "-private", it is "234". I have tried with following code but it returns an empty result:</p>
  
  <pre><code>$string = 'reply-234-private';
  $display = preg_replace('/reply-(.*?)-private/','',$string);
  echo $display;
  </code></pre>