.*
entry to allow all/any domsins. Screenshot attached 
.png
or .jpg
or whatever, we _should_ just render that as an image and not expect users to wrap it in Markdown image links 
.*
entry did the trick! i originally had these rules in there, they were added by default except for the youtube rules:
imgur\.com
giphy\.com
imgs\.xkcd\.com
reactiongifs\.com
githubusercontent\.com
youtube\.com
yt.\be
also oooh the missing feature sounds very handy!