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Re: Can I test if a parameter expansion has worked

X-seq: zsh-users 28104
From: david rayner <david@xxxxxxxxxxxxxx>
To: zsh-users@xxxxxxx
Subject: Re: Can I test if a parameter expansion has worked
Date: Tue, 20 Sep 2022 08:14:47 +0100
Archived-at: <https://zsh.org/users/28104>
In-reply-to: <CAH+w=7Y43uaXB=ZUUHiM8mE4priPD2jACvnK9zCu3qH=QGvGGQ@mail.gmail.com>
List-id: <zsh-users.zsh.org>
References: <5dc8b935-f234-ca54-0ceb-50cb1da9bc29@rayninfo.co.uk> <f93d2561-a8d8-c952-2aeb-8bcf43eef1cb@rayninfo.co.uk> <CAH+w=7Y43uaXB=ZUUHiM8mE4priPD2jACvnK9zCu3qH=QGvGGQ@mail.gmail.com>


On 15/09/2022 17:48, Bart Schaefer wrote:

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.


Bart

Generically useful thanks (sorry late reply)

f=fred.jpg

print ${f/%(#m).[pjg][npi]e#[gf]/_s$MATCH}

echo $+MATCH

1

zzapper

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

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