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

factoid_idsubjectcopulapredicateauthornamespace
15794 recursion is https://www.regular-expressions.info/recurse.html (https://www.regular-expressions.info/refrecurse.html) digitok
14980 recursion is <fact rec>
https://www.regular-expressions.info/recurse.html (https://www.regular-expressions.info/refrecurse.html)
digitok
13265 recursion is https://www.regular-expressions.info/refrecurse.html digitok
13258 recursion is https://www.regular-expressions.info/refrecurse.html digitok