How to replace p with div tag using preg_replace()? [closed]

Question

I have this code in my webpage...

<p style="text-align: center;">
   <a href="http://***.com/wp-content/uploads/2012/01/18169921.jpg">
      <img class="size-full wp-image-426 aligncenter" title="1816992" src="http://***.com/wp-content/uploads/2012/01/18169921.jpg" alt="" width="600" height="300">
   </a>
</p>

and I want it to be something like this. Replace p tag with div.

<div class="someclass">
   <a href="http://***.com/wp-content/uploads/2012/01/18169921.jpg">
      <img class="size-full wp-image-426 aligncenter" title="1816992" src="http://***.com/wp-content/uploads/2012/01/18169921.jpg" alt="" width="600" height="300">
   </a>
</div>

I have removed the <p> from the code using preg_replace() but not able to get how to add <div class="someclass"> in it while replacing the <p>.
Here is the code I have used. Plz help me to add div tag with some class.

function remove_ptags_on_images($content)
{
    return preg_replace('/<p .*>\s*(<a .*>)?\s*(<img .* \/>)\s*(<\/a>)?\s*<\/p>/iU', '\1\2\3', $content);
}
add_filter('the_content', 'remove_ptags_on_images');

Answer 1

Instead of writing a new function to replace text in your WordPress posts, you may also consider using a search plugin like Search Regex. It support regex as well.

Answer 2

I have added the div tag in the second parameter of preg_replace() and its working very fine till now.

Here is the code...

return preg_replace('/<p .*>\s*(<a .*>)?\s*(<img .* \/>)\s*(<\/a>)?\s*<\/p>/iU', '<div class="tutorial_image">\1\2\3</div>', $content);

Just want to confirm is it the correct way I have done or not.

Thanks