MediaWiki:External image whitelist

^http://www\.9to5gifs\.com/wp-content/uploads/2013/07/Happy-Birthday\.gif
 * 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