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From: Bart Schaefer <schaefer@brasslantern.com>
Date: Wed, 7 Nov 2018 07:25:13 -0800
Message-ID: <CAH+w=7ZqjCK2PWQLWVAJ+bBumrQSUw-GDugDJvDKkHZ60m0WkQ@mail.gmail.com>
Subject: Re: Match to the end of string when using (S) flag
To: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Cc: Zsh Users <zsh-users@zsh.org>
Content-Type: text/plain; charset="UTF-8"

On Wed, Nov 7, 2018 at 4:30 AM Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
>
> % text='# This is an example code that is diverse and allows to test a'
> % local last=""; : ${text//(#b)([a-d])/${last=${match[1]}}}; print -rl $last
> <empty result>
>
> With #m:
> % local last=""; : ${text//(#m)([a-d])/${last=$MATCH}}; print -rl $last
> <empty result>
>
> How come it works for you?

In your expression, $last already has a value (empty string), so you
need ${last::=$match[1]} or ${last::=$MATCH} to assign it.