Simple Line Filter

Keep or remove every line matching your Find search, using the real Find widget (so Match Case, Whole Word and Regex all work).

1. Ctrl+F, type a search, set the toggles.
2. Run Simple Line Filter: Keep Lines Matching Find (Ctrl+Alt+K) or Remove Lines Matching Find (Ctrl+Alt+D) — keybindings are active while the Find widget is open; the commands are also in the Command Palette.

Acts on the whole file. Undo with Ctrl+Z.