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Re: BUG: ${var##(|A)} fails to find longest prefix

X-seq: zsh-workers 53597
From: Philippe Altherr <philippe.altherr@xxxxxxxxx>
To: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
Cc: Zsh hackers list <zsh-workers@xxxxxxx>
Subject: Re: BUG: ${var##(|A)} fails to find longest prefix
Date: Mon, 12 May 2025 23:57:33 +0100
Archived-at: <https://zsh.org/workers/53597>
In-reply-to: <CAH+w=7bQ5db_1opF7sosb0AhMFV_r1Lda4gLgBK=vaHux7qGkA@mail.gmail.com>
List-id: <zsh-workers.zsh.org>
References: <CAGdYchujpGjntfLe7BsGWBsC0Zme7Tym8rqdq+rXxRL-dyrckw@mail.gmail.com> <CAH+w=7bQ5db_1opF7sosb0AhMFV_r1Lda4gLgBK=vaHux7qGkA@mail.gmail.com>

There's no backtracking for X|Y

Really? But then why doesn't s=AA; echo ${s#(A|)A} print the empty string?

Philippe

On Mon, May 12, 2025 at 11:25 PM Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx> wrote:

Section 14.8

X|Y
Matches either X or Y. This operator has lower precedence than any
other. The '|' character must be within parentheses, to avoid
interpretation as a pipeline. The alternatives are tried in order
from left to right.

There's no backtracking for X|Y

Follow-Ups:
- Re: BUG: ${var##(|A)} fails to find longest prefix
  - From: Bart Schaefer

References:
- BUG: ${var##(|A)} fails to find longest prefix
  - From: Philippe Altherr
- Re: BUG: ${var##(|A)} fails to find longest prefix
  - From: Bart Schaefer

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