How to use preg_replace function in PHP to remove video and image from a string

Here is the ready to use working code

<?
$str = 'video removed <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" width="400" height="225" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0"><param name="allowfullscreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="src" value="http://vimeo.com/moogaloop.swf?clip_id=11301606&amp;server=vimeo.com&amp;show_title=0&amp;show_byline=0&amp;show_portrait=0&amp;color=ff0000&amp;fullscreen=1" /><embed type="application/x-shockwave-flash" width="400" height="225" src="http://vimeo.com/moogaloop.swf?clip_id=11301606&amp;server=vimeo.com&amp;show_title=0&amp;show_byline=0&amp;show_portrait=0&amp;color=ff0000&amp;fullscreen=1" allowscriptaccess="always" allowfullscreen="true"></embed></object>
and image removed
<a href="http://vikas/marilynmanson.com/wp-content/uploads/2010/05/solitude.jpg"><img src="http://vikas/marilynmanson.com/wp-content/uploads/2010/05/solitude.jpg" alt="" title="solitude" width="325" height="498" class="aligncenter size-full wp-image-170" /></a> ';

$str = preg_replace("/<.*?>/", "", $str);
echo $str;
?>