#1: How to do vi's 'g/foo/s/x/y/' #2: + with a Q-R "yes/no?"

[David Combs]

(1) How to do, in gnu-emacs,  vi's 'g/foo/s/x/y/':

That is, "on all lines that contain regexp "foo", change x to y.

And maybe also with option: only the first one on that line, or all of them? 


(2) Same as above, BUT WITH A QUERY-REPLACE-LIKE "YES|NO|!|etc" prompt.

(No, I believe that vi-emulator .el-package does NOT implement
vi's "g/pat/<vi-command>/"  

  (Sure would be nice if it did!)



Thanks so very much!


David