Regex command for deleting and replacing

[Martin Hrebik]

Hello. Could please someone write a regex command to completely delete this:

4512) SOME NAME
Unused 4512

So nothing is left? Not even empty line?

And another thing. I need to make this:

4875) SAME NAME
Used
7854) ANOTHER NAME
Used
74) NAME
Used
1) YET ANOTHER NAME
Used

Into this:

4875|7854|74|1

So I can just add "Unused (" at the start and ")" at the end to use it later in different text file to sort of compare used line's IDs.
So I'll just search for:

Unused (4875|7854|74|1)

Thank you very much.

[Sasumner]

I think you're in the wrong place to ask this question.

[Martin Hrebik]

Oh. I'm sorry. I did ask for a notepad++ regex command earlier here and someone helped me so I though I could ask again. But I did get help in another forum.