Collapse out all lines not matching "/pattern"?

In regular/normal vim editing, is there a method to collapse out of view all lines NOT matching "/pattern"?

Though I use vimdiff a lot, the only relevance to vimdiff is the way it collapses out lines not relevant to the differentiation process.  So, when I'm using regular VIM, I'm wondering if there's a way to search for "/pattern" ---and--- only see matching lines?  I also tend to have line numbers on a lot, which would greatly help me to focus on certain things.

Thank you.

R,
-Joe Wulf

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