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Re: Can I test if a parameter expansion has worked

X-seq: zsh-users 28084
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: zzapper <zsh@xxxxxxxxxxxxxx>
Cc: zsh-users@xxxxxxx
Subject: Re: Can I test if a parameter expansion has worked
Date: Thu, 15 Sep 2022 09:48:57 -0700
Archived-at: <https://zsh.org/users/28084>
In-reply-to: <f93d2561-a8d8-c952-2aeb-8bcf43eef1cb@rayninfo.co.uk>
List-id: <zsh-users.zsh.org>
References: <5dc8b935-f234-ca54-0ceb-50cb1da9bc29@rayninfo.co.uk> <f93d2561-a8d8-c952-2aeb-8bcf43eef1cb@rayninfo.co.uk>

On Thu, Sep 15, 2022 at 12:34 AM zzapper <zsh@xxxxxxxxxxxxxx> wrote:
>
> print ${f/%(#m).[pjg][npi]e#[gf]/_s$MATCH}
> stuff.txt  #  expansion has obviously left the input unchanged but can I
> test for that???

In the general case, no, as PWS has already addressed.

In this specific case, tho, if you "unset MATCH" before doing the
substitution, you can test $+MATCH after.

Follow-Ups:
- Re: Can I test if a parameter expansion has worked
  - From: david rayner

References:
- Can I test if a parameter expansion has worked
  - From: zzapper
- Re: Can I test if a parameter expansion has worked
  - From: zzapper

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