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Date: Sun, 25 Nov 2012 13:30:45 -0500
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Message-ID: <CACeGjnWHP4pYSbjRrvZGCpd8tOCEpuYaTODZ1=LiZuJO5tNTuw@mail.gmail.com>
Subject: Re: Regular expression expanding and matching
From: Vin Shelton <acs@alumni.princeton.edu>
To: Mark van Dijk <lists+zsh@internecto.net>
Cc: "zsh-users@zsh.org" <zsh-users@zsh.org>
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On Sun, Nov 25, 2012 at 10:45 AM, Mark van Dijk
<lists+zsh@internecto.net> wrote:
> Apparently there is no expansion of ${todaysday} and ${yesterday}.
> This is not really surprising because in regular expressions many
> characters have a different meaning.

>So what's the proper way to achieve this type of expression matching?

Enclosing the expressions in double quotes seems to work for me:

if [[ $somestring -pcre-match "\d{4}${todaysday}" ]]; then
    echo "somestring matches today"
elif [[ $somestring -pcre-match "\d{4}${yesterday}" ]]; then
    echo "somestring matches yesterday"
fi
+./tt:8> [[ $somestring -pcre-match "\d{4}${todaysday}" ]]
+./tt:9> echo 'somestring matches today'
somestring matches today

Regards,
  Vin