Help with :v

Hi,
I would like to delete everything not matching to a pattern...
I usually do it this way:

:v/my pattern/d<CR>

and it works perfect to any single line pattern...

my problem is that I want to keep something like this:

ABC ...
....
....
...
And until the first empty line...

How it is possible ? I was thinking something like this:
:v/ABC\(.|\n)*^\s*$/d

but not really work.

Thanks in advice.

Br,
Peter.

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