in reply to remove lines that do not match search pattern

Capture lines that 'do not' (  !~ ) match your regex...
or
capture lines that are not excluded by  unless =~ your regex

Or did you mean you want another way to write the regex (which should be enclosed by code tags for readability).

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Re^2: remove lines that do not match search pattern
by jasonwolf (Sexton) on Aug 03, 2015 at 14:27 UTC

    I only want to save the lines that match - meaning that only have a MAC address in the line, and delete all other data.

    thanks!