Duplicate partial line text with vi/vim

Question

I have two lists like these below:

abc.domain.com defg.domain.com hijklmn.domain.com

abc.domain.com/sub/ defg.domain.com/anothersub/ hijklmn.domain.com/thirdsub/

I need to make these two lists appear like so:

abc.domain.com?ref=abc defg.domain.com?ref=defg hijklmn.domain.com?ref=hijklmn

abc.domain.com/sub/?ref=sub defg.domain.com/anothersub/?ref=anothersub hijklmn.domain.com/thirdsub/?ref=thirdsub

How to I accomplish this in vi/vim?

Kent · Accepted Answer · 2020-02-04 16:01:21Z

Assume the two lists are in two different buffers. We can do the job using vim's :s command:

For list1:

%s/\v([^.]+).*/&?ref=\1/

%s#\v.*/([^/]+)/$#&?ref=\1#

If the two lists are mixed in one buffer, you can use :g command to do the substitution only on a certain target.