From mboxrd@z Thu Jan  1 00:00:00 1970
From: Memnon Anon <gegendosenfleisch@googlemail.com>
Subject: Re: A quick way to empty contents of entries?
Date: Wed, 23 Nov 2011 17:11:26 +0000 (UTC)
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Carsten Dominik <carsten.dominik@gmail.com> writes:
> On Nov 4, 2011, at 7:56 AM, gylns wrote:
>> Hi, all
>> I want to empty all my contents but leave only with the headlines and the
>> properties, is there a fast way?
[...]
> For one file:
>
>   perl -ne 'print if /^\*+ / or /^\s*:PROPERTIES:\s*$/../^\s*:END:\s*$/' old.org > stripped.org

Hmm... perl.

Within emacs, that would be something like

C-<
M-x keep-lines RET
^\*\|:PROPERTIES:\(.\|\n\)+?:END:
(\n via "C-q C-j")

...

right?

Memnon