between mark a and mark b: 'a,'b
goto lines containing Abc: g/Abc
recognizable substitute: s/yy/\=i/
= prefixes a variable (escaped with \)
A problem is that it will only replace the first `yy` on the line (if you add g, to make it s/yy/\=i/g, it replaces all of them, but with the same value of i.
How to make it increment multiple yy's on the one line?
How to make it increment multiple yy's on the one line?