Possible to add spacing every 4 characters in vi?

Is it possible to add spacing every 4 characters 开发者_Go百科in vi? And if it is, what's a good google term to search for to learn how to do similar stuff?

To add a space every 4 characters you could use the following command (at least in VIM):

:%s/\(....\)/\1 /g

If you Google "VIM Substitution" you should end up with some useful examples.

Example:

To add a space every 4 characters you could use

becomes

To a dd a  spa ce e very  4 c hara cter s yo u co uld  use