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variables as grouping alternative?

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From: Vin Shelton <acs@xxxxxxxxxxxxxxxxxxxx>
To: zsh-users@xxxxxxx
Subject: variables as grouping alternative?
Date: Wed, 24 Jul 2013 14:14:33 -0400
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Is there a way to use a variable as a grouping alternative?  E.g.:

pkgbase=libpng
f=( $ZIPROOT/$pkgbase-*.(tar|tar.*|tgz)(Nom) ); echo $f

yields:
/opt/zip/libpng-1.6.3.tar.gz /opt/zip/libpng-1.2.46.tar.gz
/opt/zip/libpng-1.2.40.tar.xz /opt/zip/libpng-1.2.31.tar.bz2

x="tar|tar.*|tgz"
f=( $ZIPROOT/$pkgbase-*.($x)(Nom) ); echo $f

yields nothing

Thanks in advance,
  Vin

Follow-Ups:
- Re: variables as grouping alternative?
  - From: Jérémie Roquet

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