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From: Bart Schaefer <schaefer@brasslantern.com>
Date: Sat, 16 May 2020 00:03:09 -0700
Message-ID: <CAH+w=7ZXCu__nZwGEjsJ8vrXUsXommS=EkH-ScJ+tKLw2ph8hg@mail.gmail.com>
Subject: Re: Expanding a variable extracted from another file
To: TJ Luoma <luomat@gmail.com>
Cc: Zsh MailingList <zsh-users@zsh.org>
Content-Type: text/plain; charset="UTF-8"

On Fri, May 15, 2020 at 11:48 PM TJ Luoma <luomat@gmail.com> wrote:
>
> Assume I have a plain text file "$HOME/MyReferenceDoc.txt" which has
> these lines:
>
> "$HOME/glue/sticks"
> "$HOME/foo/bar"
> "$HOME/work/files"
>
> And I want to get the matching line which has '/foo/'

MYVAR=${(f@M)$(<~/MyReferenceDoc.txt):#*/foo/*}

> My question is: How can I tell zsh the it should expand the "$HOME" in
> "$MYVAR" to "/home/james"?

print -r -- ${(Qe)MYVAR}

Or leave out the Q if you want the double-quotes preserved.