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From: pjb@informatimago.com (Pascal J. Bourguignon)
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Subject: Re: delete non-matching lines
Date: Tue, 11 Aug 2009 16:33:49 +0200
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Nachiket Gokhale <gokhalen@gmail.com> writes:

> How do I delete all lines starting with
>
> "ESPN"

  M-x delete-matching-lines RET ^ESPN RET

>
> And, the opposite:
>
> How do I delete all lines not starting with
>
> "ESPN"

  M-x delete-matching-lines RET ^\([^E C-q C-j ]\|E[^S C-q C-j ]\|ES[^P C-q C-j ]\|ESP[^N C-q C-j ]\) RET
 
Or perhaps just:

  M-x delete-matching-lines RET ^\([^E]\|E[^S]\|ES[^P]\|ESP[^N]\) RET

if you are lucky.



You may also use:

  C-x h M-| grep    ESPN RET

or

  C-x h M-| grep -v ESPN RET

but this is cheating.

-- 
__Pascal Bourguignon__