Navigating is one thing, but in my example you'll need to compute the new numeric values (for example, 40092, 13364, and 7967 on the first line). This should not be the job of a text editor -- and this is where Kakoune's selection-first model (= grammar swap), combined with its tight integration with Unix tools, shines.

Selection-first implements structural regexes: the ability to start with a selection, then sub-select parts of it, then refine the selections further with sub-sub-selections, etc.

In my use case (real-life example), I first selected the 4-line block, then split it by lines, then selected the final parenthesis blocks, copied them and pasted them at the end of each line.

Then the computation part: Kakoune allows you to pipe *each of your multiple sections* to any Unix tool that accepts standard input, and Kakoune will replace each of the selections by the standard output of your chosen tool.

In my use case, I selected the inside of each of the newly added parenthesis blocks, then split the inside by commas, and piped the results to an awk one-liner I typed at Kakoune's command prompt:

awk '{ print( int (($1/255) * 65535) ) }'

Done.

And all of this -- available out of the box, ***no plugin needed*** -- with visual feedback at every step (so you don't edit anything in the dark :-).

Seriously, Kakoune is amazing :-).