From Fedora Project Wiki
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# Syntax is as follows: # * Everything from a "#" character to the end of the line is a comment # * Every non-blank line is a regex fragment which will only match hosts inside URLs # We trust these sites to not be spammy: fedorahosted\.org fedorapeople\.org fedoraproject\.org redhat\.com timeanddate\.com webchat\.freenode\.net #