View source for MediaWiki:External image whitelist

 #Leave this line exactly as it is<pre>
#Put regular expression fragments (just the part that goes between the //) below
#These will be matched with the URLs of external (hotlinked) images
#Those that match will be displayed as images, otherwise only a link to the image will be shown
#Lines beginning with # are treated as comments
#This is case-insensitive
^https://www\.encyclopediaofmath\.org/
^\//
#Put all regex fragments above this line. Leave this line exactly as it is</pre>