WordPress Plugin – YouTube for XHTML and Mobile

I'm sure there could be exceptions to the way someone embeds the code and my regex is never great. I've also added DailyMotion to the list of full web filtered. However I can't find any easy way to find a translation to their rather weird french mobile site.

<?php
/*
Plugin Name: XHTML Safe Videos
Plugin URI:  http://blog.artesea.co.uk/
Description: Converts YouTube and DailyMotion embed code into correctly formed XHTML (and even displays a mobile YouTube link instead on Mobile themes)
Author:      Ryan Cullen
Version:     0.3
Author URI:  http://blog.artesea.co.uk/
*/

function rtc_xhtml_youtube($content) {
 //Get the name of the Wordpress Template being used
 $theme = get_template();

 //If this *isn't* a mobile theme
 if(stristr($theme, 'mobile') === FALSE) {
  $content = preg_replace('|<object(.*?)(.*?)|',
                          '',
                          $content);
  $content = preg_replace('|<object(.*?)(.*?)|',
                          '',
                          $content);
  $content = preg_replace('|<object(.*?)(.*?)|',
                          '',
                          $content);
 }
 else {
  $content = preg_replace('|<object(.*?)(.*?)|',
                          '',
                          $content);
  $content = preg_replace('|<object(.*?)(.*?)|',
                          '',
                          $content);
 }
 return $content;
}

add_filter('the_content', 'rtc_xhtml_youtube');
?>