clojure.string/index-of

(clojure.string/index-of s sub) (clojure.string/index-of s sub from)

Answers the index of the first occurrence of the literal string sub in s at or after from (default 0), -1 when missing. Works as a function value too.

Deviation: a missing sub answers -1, where the oracle's clojure.string/index-of answers nil.