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From: Teemu Likonen <tlikonen@iki.fi>
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Subject: Re: delete non-matching lines
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On 2009-08-11 06:59 (-0700), Nachiket Gokhale wrote:
> How do I delete all lines starting with
>
> "ESPN"

M-x flush-lines RET ^ESPN RET

(or its alias M-x delete-matching-lines)

> How do I delete all lines not starting with
>
> "ESPN"

M-x keep-lines RET ^ESPN RET

For more info:

    C-h r m Other Repeating Search