$content = '<div class="zzz">wwwww<div>zzz</div>yyy<div>qqqq</div>ppp</div>';
$pattern = "|<div class=\"zzz\">(.+?)<\/div>|";
$text = preg_match_all($pattern, $content, $return);
echo $return[1][0];
Простой
Простой
