Interactive search/replace regex in Vim?

Question

I know the regex for doing a global replace,

     %s/old/new/g

How do you go about doing an interactive search-replace in Vim?

Answer 1

Neovim now has a feature to preview the substitution:

Image taken from: https://medium.com/@eric.burel/stop-using-open-source-5cb19baca44d Documentation of the feature: https://neovim.io/doc/user/options.html#'inccommand'