GNU bug report logs - #35020
I apologize it's not the right place, but I need answer

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Budi <budikusasi <at> gmail.com>
To: bug-sed <at> gnu.org
Subject: Re: I apologize it's not the right place, but I need answer
Date: Wed, 27 Mar 2019 20:25:24 +0700

How can sed regex substitution replacement be the Hold space content ?
I do need the answer so really appreciate. Thanks much!

On 6/11/18, Budi <budikusasi <at> gmail.com> wrote:
> ​How to use SED command(s) that will replace the shell's pipe command in
> order to perform more efficient, e.g:
>
> echo abcde​ | sed -r 's/cd/XX/' | sed 's/[^x]/z/ig'
>
> become far more efficient and compact, might be look like this,
>
> echo abcde​ | sed -r 's/cd/XX/ {N: s/ ...........    }
>
> ( ...so on. That's what I am asking for )
>
> both will give the same result   zzXXz
>

Message #8 received at 35020 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: Budi <budikusasi <at> gmail.com>, 35020 <at> debbugs.gnu.org
Subject: Re: bug#35020: I apologize it's not the right place, but I need answer
Date: Wed, 27 Mar 2019 16:23:48 -0600

tags 35020
close  35020
stop

Hello,

On 2019-03-27 7:25 a.m., Budi wrote:
> How can sed regex substitution replacement be the Hold space content ?
> I do need the answer so really appreciate. Thanks much!

s/// command operate on the pattern space.
But you can use the 'x' command the exchange the content
of the hold and pattern space, and then use "s///".

Example:

This sed program accumulates even numbers
into the hold space (H), and prints the odd values (p).
At the end of the input ($), it fetches back the hold space content (x),
performs a regex substitution on it (s) and prints it (p).

$ seq 0 5 50 | sed -n '/0$/H;/5$/p;${x;s/\n/===/g;p}'
5
15
25
35
45
===0===10===20===30===40===50


regards,
 - assaf

Message #13 received at submit <at> debbugs.gnu.org (full text, mbox):

From: bill-auger <bill-auger <at> peers.community>
To: bug-sed <at> gnu.org
Subject: Re: bug#35020: I apologize it's not the right place, but I need answer
Date: Wed, 27 Mar 2019 21:35:10 -0400

On Wed, 27 Mar 2019 16:23:48 -0600 Assaf wrote:
> $ seq 0 5 50 | sed -n '/0$/H;/5$/p;${x;s/\n/===/g;p}'
> 5
> 15
> 25
> 35
> 45
> ===0===10===20===30===40===50

mmm, nerdelicious :)

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