Globally append to line with matching term in vim

Question

I am sure this is easy, I am just missing a character or two.

I need to search for a particular term in a file, and when I find it, I need to append something to that

Answer 1

:%s/green/bright &/g: Replace each "green" with "bright green" in the file.

&: substitute matched string. You can do anything you can imagine.

You can use the flag \v so we don't have to use as many escape characters.

append the parameter --no-startup-id after exec or exec_always

:%s/exec\(_always\)\?/& --no-startup-id/g

simplify it:

:%s/\vexec(_always)?/& --no-startup-id/g