Cleaning hyperlinked URLs (such as YouTube)

No worries. Would be great to see this as part of Postie’s core, but I’ve created a function that seems to do the trick for anyone in need:

(modified from this https://stackoverflow.com/questions/55007093/remove-tags-a-to-a-specific-url-domain-php)

add_filter('postie_post_before', 'unlink_embed_links');

function unlink_embed_links($post) {
	$post['post_content'] = remove_domain($post['post_content'], 'amazon.com', 'animoto.com', 'cloudup.com', 'crowdsignal.com', 'dailymotion.com', 'flickr.com', 'giphy.com', 'imgur.com', 'issuu.com', 'kickstarter.com', 'meetup.com', 'mixcloud.com', 'photobucket.com', 'reddit.com', 'reverbnation.com', 'scribd.com', 'slideshare.net', 'smugmug.com', 'soundcloud.com', 'speakerdeck.com', 'spotify.com', 'ted.com', 'tiktok.com', 'tumblr.com', 'twitter.com', 'videopress.com', 'vimeo.com', 'wordpress.org', 'wordpress.tv', 'youtube.com', 'youtu.be');
    return $post;
}

function remove_domain($str, $domainsToRemove) {
    $domainsToRemove = is_array($domainsToRemove) ? $domainsToRemove : array_slice(func_get_args(), 1);

    $dom = new DOMDocument;
    $dom->loadHTML("<div>{$str}</div>", LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

    $anchors = $dom->getElementsByTagName('a');
    // Code taken and modified from: http://php.net/manual/en/domnode.replacechild.php#50500
    $i = $anchors->length - 1;
    while ($i > -1) {
        $anchor = $anchors->item($i);

        foreach ($domainsToRemove as $domain) {
            if (strpos($anchor->getAttribute('href'), $domain) !== false) {
				if (strpos($anchor->textContent, $domain) !== false) { 
				// only do it if the link text contains the domain (otherwise it is a deliberate text link and should remain linked)
					$new = $dom->createElement('p', htmlentities($anchor->textContent)); // wrap url in p tag
					//$new = $dom->createTextNode($anchor->textContent); // alternatively, place url only without wrapping
					$anchor->parentNode->replaceChild($new, $anchor);
				}      
            }
        }

        $i--;
    }

    // Create HTML string, then remove the wrapping div.
    $html = $dom->saveHTML();
    $html = substr($html, 5, strlen($html) - (strlen('</div>') + 1) - strlen('<div>'));

    return $html;
}