[jlp__inf]

Yup, notably the famous %s/PATTERN1/PATTERN2/g, which I suppose comes from sed

[piekvorst]

vi and sed took the s/ syntax from ed, independently of each other.

[zvr]

Right! ed was the first one, and its ideas and commands influenced sed (a "streams" ed), and ex (an "extended" editor, which also had a "vi"sual mode).