Hide all (not)matching lines in Vim

Question

Is it possible to show/hide all matching lines in vi or Vim? Not highlight but just show only those lines.

For example I have a text with word the word ERROR. How do I make it show only lines containing ERROR and how to show only lines without ERROR?

Is there a solution without deleting all matching lines and then just undoing it?

Answer 1

Do you know about the :global command? Does this do what you want?

:g/ERROR

and for the opposite:

:g!/Error

or equivalently:

:v/Error