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To: zsh-workers@zsh.org
From: Stephane Chazelas <stephane.chazelas@gmail.com>
Subject: Re: substitution groups and patterns i replace string (Emacs' \\1
 etc.)
Date: Tue, 8 Mar 2016 12:13:49 +0000
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User-Agent: Mutt/1.5.21 (2010-09-15)
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2016-03-07 18:52:34 -0800, Bart Schaefer:
> 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.
[...]

Note that ksh93 does support

$ var=aaabbcdd
$ print -r -- "${var//@(?)\1/2<\1>}"
2<a>a2<b>c2<d>

That is \1 both as a back-reference in the pattern and capture
group for the substitution.

-- 
Stephane