This is the revision history for ref in <libera.chat:#regexen>

factoid_idsubjectcopulapredicateauthornamespace
15867 ref is http://www.regular-expressions.info/refflavors.html digitok <freenode.net:#regex>
15797 ref is <fact reference>
Not Available		 digitok <freenode.net:#regex>
11808 ref is http://www.regular-expressions.info/refflavors.html digitok <freenode.net:#regex>
11645 ref is http://bit.ly/1VppLoL digitok <freenode.net:#regex>
11644 ref is http://bit.ly/1VppLoL simcop2387 <freenode.net:#regex>
11642 ref is http://bit.ly/1VppLoL digitok <freenode.net:#regex>