select all but

[Randalix]

I have a file and want to delete all lines that do not contain a keyword.
I've tried solutions suggested here stackoverflow (negative look-ahead), but I get error: look-around, including look-ahead and look-behind, is not supported.
Is there another way to do this? I can use sed, but in helix?

[Randalix]

Ah, I've found a way:

• Select the lines I want to keep
• yank them to the system clipboard
• delete everything
• paste from the system clipboard
• delete extra lines

Let me know if there is a better way.

[mweihs]

Let's say you want to keep all lines with "foo". Select whole file ("%"), pipe to grep:
| grep -v foo

[pascalkuthe]

You can use A-K to remove selections that match a regex so %A-sA-K<word><ret>d does what you want (select entire file, split selection into lines, remove selections that contain regex/word, delete

[Randalix]

Nice, thanks!

[hholst80]

I am using Helix 24.7 and ALT-K no longer seems to do anything?