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Thu, 15 Sep 2022 09:49:09 -0700 (PDT) MIME-Version: 1.0 References: <5dc8b935-f234-ca54-0ceb-50cb1da9bc29@rayninfo.co.uk> In-Reply-To: From: Bart Schaefer Date: Thu, 15 Sep 2022 09:48:57 -0700 Message-ID: Subject: Re: Can I test if a parameter expansion has worked To: zzapper Cc: zsh-users@zsh.org Content-Type: text/plain; charset="UTF-8" X-Seq: 28084 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: On Thu, Sep 15, 2022 at 12:34 AM zzapper 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.