How to write a regular expression for preg_match_all so that it doesn't cut the closing div?

Question

Regular Expressions

How to write a regular expression with a check that if there is a nested div, then we skip both the opening and closing divs.

$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];

Here it cuts off incorrectly - how to count divas or their pairs?