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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Mon, 7 Mar 2016 18:52:34 -0800
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Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
        "Re: substitution groups and patterns i replace string (Emacs' \\1 etc.)" (Mar  6,  8:15am)
References: <87k2lk2ws9.fsf@debian.uxu> 
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To: Zsh Users <zsh-users@zsh.org>
Subject: Re: substitution groups and patterns i replace string (Emacs' \\1 etc.)
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On Mar 6,  8:15am, Mikael Magnusson wrote:
}
} % echo ${a//(#b)([aoeui])/${(U)match[1]}}

It's actually quite simple to make $1, $2, ... refer to the values in
the $match array during ${v//p/r} substitutions.  This would make the
syntax look very perl-ish, but would mean you can't combine backrefs
with expansions of the normal positional parameters.

Anyone interested?  Discuss?

Incidentally, for a fun time consider replacing ${(U)match[1]} with
${(P)match[1]} in that substitution of Mikael's.