Combining two regex preg_match_all searches

Question

I'm an average level PHP coder and I'm trying to grab all images and iframes from within my html content, but I've managed to exceed my ability level!

I have two different calls which both work independently:

function get_the_images($content) {

     //$matches will be an array with all images
     preg_match_all("/<img[^>]+\>/i", $content, $matches);
     return $matches;

}

function get_the_iframes($content) {

     //$matches will be an array with all iframes
     preg_match_all('#(?:<iframe[^>]*)(?:(?:/>)|(?:>.*?</iframe>))#i', $content, $matches);
     return $matches;

}

What I'd like to do is combine those 2 into one single preg_match_all search. Can anyone help me combine the two together?

Thanks in advance for any help!