$subject = "<br /><br /><table style='width:90%; height:0px;margin:auto;'><tr><td class='code'><strong>Code<br /></strong><code>$1</code></td></tr></table><br />";
$pattern = '!<code>(.+)</code>!iUs';

preg_match($pattern, $subject, $match);
var_dump($match);