MediaWiki:External image whitelist

https://upload.wikimedia.org/wikipedia/commons/thumb/3/31/ProhibitionSign2.svg/150px-ProhibitionSign2.svg.png http://d2ws0xxnnorfdo.cloudfront.net/meme/636266
 * 1) Leave this line exactly as it is
 * 2) Put regular expression fragments (just the part that goes between the //) below
 * 3) These will be matched with the URLs of external (hotlinked) images
 * 4) Those that match will be displayed as images, otherwise only a link to the image will be shown
 * 5) Lines beginning with # are treated as comments
 * 6) This is case-insensitive
 * 1) Put all regex fragments above this line. Leave this line exactly as it is