How to write only one template for exchanging two lines in two directions in vim

Question

xxx <=> zzz

---

Source text:

xxxyyyzzz

Launch command:

:s/???/???/

It will be:

zzzyyyxxx

Run the same command:

:s/???/???/

Return to source:

xxxyyyzzz

---

just how to switch case (~)

aBCdeFg aBCdeFg

Answer 1

Take a look at this: Is it possible to replace multiple elements in one regex in VIM or Perl?

Answer 2

Try the following:

 :s/(...)(yyy)(...)/\3\2\1/ 

Answer 3

You can always write your own macro. I assume that the macro for this particular example would not be useful to you, but I could post it if you want.