This is the revision history for ref in <freenode.net:#regex>

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