I don't think that accomplishes the goal. Your solution removes all the blank lines, not just the double-spacing (unlike the other solutions). For example, yours converts a\n\n\n\nb\n\n to a\nb\n rather than a\n\nb\n.

In reply to Re^2: how to use matching operator on newlines by ikegami
in thread how to use matching operator on newlines by redss

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