Remove all lines without an @ character in Notepad++

Question

I have a list like:

asd@asd
abcdefgh
abcde@fgh
ijklmnop

I want to remove all lines without the symbol @. The result should be:

 asd@asd
 abcde@fgh

Can this be done in Notepad++, and if so, how?

Answer 1

Try looking for:

^[^@]*$

and replacing with an empty string.