How can I quickly add something to multiple lines in vim?

Question

I'm trying to get away from using the arrow, but there is one thing that I haven't decided yet without using the arrow keys. Take this example:

var1 = "1"
var2 = "2"
var3 = "3"
var4 = "4"

Now I want this to be:

var_1 = "1"
var_2 = "2"
var_3 = "3"
var_4 = "4"

Using the arrows, I would just get var1, insert and add an underline, and then the down arrow and do the same. The problem with using hjkl is that I cannot be in insert mode, so I need to release, move down, paste ... repeat the repeat, which required more work. Is there any other way to do this?

Answer 1

You can also use the visual block insert:

• go to "1" in "var1"
• click CTRL+V
• j ,
• I ( i)
• _
• <ESC>

( - )

Answer 2

. , :

• 1G0 →
• f1 → "1"
• i_<ESC> → "_"
• j. →
• j. →
• ...

, , "ex":

• :%s/var/var_/

, johusman.

Answer 3

, 1, 1...

:

qqfra_<Esc>+q3@q

• q
• q q
• f
• r 'r'
• a
• _
• Esc
• +
• 3
• @
• q q

11.

() substitute:

:%s!r!&_<CR>

Par 9!

[... VimGolf!]

Answer 4

I prefer: replace with visual block mode.

%s/var\zs\ze\d/_/

Answer 5

I always have line numbers, so I would do for example

1,4 s/var/var_/

It looks like

% s/var/var_/

but it only works on named strings. You can use visual mode to mark lines if you don't like to enter a range (prefix 1,4) in your command.