i have this code for our custom amp page in wordpress this code remove our all images in content area but i want these images show as a amp images
$content = get_the_content();
$content = preg_replace("/<img[^>]+>/i", " ", $content);
$content = apply_filters('the_content', $content);
$content = str_replace(']]>', ']]>', $content);
$content = str_replace("https://www.youtube.com/embed/","",$content);
$content = preg_replace('/<iframes+.*?s+src=(".*?").*?</iframe>/', '<amp-youtube
data-videoid=$1
layout="responsive"
width="480" height="270"></amp-youtube>', $content);
echo $content;
help me out how to customize preg_replace function to replace tags to <amp images