Says chester:

In vim...

The g/re/p command actually goes back to ed, which was the original Unix editor, back around 1972, and is still provided with all Unix systems. After ed came vi, the visual editor, with command syntax similar to ed's, and then vim, which is an improved version of vi.

Early versions of Unix also had a gres command (perform a substitution on all matching lines) but it was obsoleted by sed and abandoned.