@yariplus If i could be so bold and throw up another embed puzzle.
This time rumble, and with mixed success, if you paste an embed link form rumble for e.g.
https://rumble.com/ve2ez5
This works, but currently displaying a random rumble video.
Here is the long URL for the same video for reference:
https://rumble.com/ve2ez5-airplane-returns-to-denver-after-engine-malfunction.html
This is what I have so far that works to embed and display a rumble video but misses the target video! 
replace:
(?:<a.*?)?(?:https?:\/\/)?(?:www\.)?rumble\.com\/([a-zA-Z0-9_-]{4,6})(?:.*?\/a>)?
embed:
<div class='embed-wrapper'><div class='embed-container'><iframe src='https://www.rumble.com/embed/rumble_$1/?pub=4' frameborder='0' allowfullscreen></iframe></div></div>