G/RE/P is the instantiation of the regex model in UNIX, and comes from Ken Thompson directly. Its the same model in ed, and in sed, and awk.
I imagine the author of grep, Ultimate Unix Geek, squinting at vi;
Either qualify "which grep" or define "author" because to me, Cervantes wrote Don Quixote, not the translator.
G/RE/P is the instantiation of the regex model in UNIX, and comes from Ken Thompson directly. Its the same model in ed, and in sed, and awk.