A more recent, revised and updated version of this paper has been published (2019)
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External image whitelist

From Old European

#Leave this line exactly as it is
#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

#Put all regex fragments above this line. Leave this line exactly as it is