[pixelmonkey]

rga, aka ripgrep-all, is my go-to for this. I suppose grep is a form of AI -- or, at least, an advanced intelligence that's wiser than it looks. ;)

https://github.com/phiresky/ripgrep-all

[gyrovagueGeist]

+1 for this. I use rga all the time. it's a "simple" solution but often enough for what I actually needed.