Facing with a data file which contains more than 7 million lines, I need to delete all lines containing <patternA> but not containing <patternB>.
So far the only way I can think of is kind messy, something like this:
:g/<patternB>/s/<patternA>/<patternC>/
:g/<patternA>/d
:%s/<patternC>/<patternA>/
But I really like to know how this can be done in a better way, like a single global replacement command or something.
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