Wordpress / PHP用div替换caption标签

I have this

[caption]<img />[/caption]

I have removed the caption tags usign this

$content = preg_replace("/\[.*?\]/", "", $content);

However, I want to replace it with div like this

<div><img></div>

What I am missing? Any help is appreciated.

you could try like:

$search_for = '/\[caption\](.*?)\[\/caption\]/is';
$replace_with = '<div>$1</div>';
$str = "[caption]<img />[/caption]";
$replaced = preg_replace($search_for, $replace_with, $str);
echo $replaced;