Neovim: Global search and replace
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This is notoriously cumbersome in (Neo)vim.
For a quick experience you will need Telescope.
First, you need to search the occurrencies you want to replace. Run :Telescope live_grep and type what you need. Remember to use rg syntax for optimal filtering.
When you are satisfied with the results, press CTRL-Q to add the results to the quickfix list (:h Quickfix).
Ultimately, type :cdo s/gr/ep/gc where s/gr/ep/gc is the typical, perl-based, search syntax inside vim. Use gc to give confirmation for every item, remove c if you feel very sure. I am not sure if g is actually needed but we’ll leave it to make sure.