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Date: Thu, 03 Mar 2016 09:41:40 +0000
From: Peter Stephenson <p.stephenson@samsung.com>
To: zsh-users@zsh.org
Subject: Re: substitution groups and patterns i replace string (Emacs' \\1 etc.)
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On Thu, 3 Mar 2016 02:08:22 +0100
Emanuel Berg <embe8573@student.uu.se> wrote:
> When I do substitution, can I do groups and patterns
> like in Emacs with \\1, \\2 to reference the
> particular matches, and thus construct the replace
> string out of them any way I like?

You do it with $match, and if you need to refer to positions in the
original string, $mbegin and $mend.  See the description of the (#b)
pattern in the zshexpn manual page.

local -a match mbegin mend

if [[ $url = (#b)http://(*) ]]; then
  print $match[1]
fi

Works with other forms of pattern matching.

pws