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bh=RFEVeptP/7eci63T6cXjUpOvm0l+bOUv3qR6Q33Ac9M=; b=EAUx6Ycd2RhAhph0GNlwyGbqkmhSMu8KpLtGJ1RBMGNv1gYxzvwrH0157ZxE82Hh/y wZrx8BnkfIHDFylJE4HCeSl1tRffRxpm9pSnHPbnQmG/SY6rd4yEWCNFJ0rwVd9knOOC NedpKjI/VP63vPAiALheGzp13Ab2pThGymtGGB6lSRnAA88fYOHH1YfJ3bEYmPGbjqWJ Nkj5cW6qA1WQz1XUCKIKXVbpbHbvrBjbvIsXfJetSFIiG4aM0DYKh6GlrRWXfX0sYpBk 542kAzVYrbOUIgFzz/1K/vj4xsvEFLgBIToJ+xnUuQUnJiJrPDJWyDvNkqKSY9DUxiiU A3+Q== X-Gm-Message-State: AOJu0YyWyjgS3ViWE19uS2v8Fl4Ox+ito+zd2flodub+FLMfiMTEPBXw X0nUYzt/GEQB/iDHEwUVSoF9GW2JKxn+MSbnjvp78w== X-Google-Smtp-Source: AGHT+IGf1MVKegnd/+2ZFCP09OQUcKf8mByE5vWJvENFWKoSIklW9HpstfbI1m5KaShJtov2i7imh/P7wpVEI4oC4pU= X-Received: by 2002:a17:907:7616:b0:99c:5056:4e31 with SMTP id jx22-20020a170907761600b0099c50564e31mr1704732ejc.15.1692242388674; Wed, 16 Aug 2023 20:19:48 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Bart Schaefer Date: Wed, 16 Aug 2023 20:19:37 -0700 Message-ID: Subject: Re: Help: f (repeat) modifier, and histsubstpattern + :s/l/r/ modifier escaping of [{()}] To: Andy Kluger Cc: zsh-users@zsh.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Seq: 29150 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 Wed, Aug 16, 2023 at 11:33=E2=80=AFAM Andy Kluger = wrote: > > setopt histsubstpattern > s=3D'left[()]over' > print -rl -- ${s:fs/(\\{\\}|\\(\\)|\\[\\])//} > # printed: left[]over > # expected: leftover > > I'm having two confusions: > > 1. Why do I need to double-backslash before each > brace/bracket/parenthesis, rather than single-backslash? Because the pattern is being passed through possible parameter substitution before being passed through the pattern parser. > 2. Why doesn't the replacement seem to happen to each subsequent > result of a former replacement? Because there's a bug. The pattern (and the replacement, though it's empty in this case) are both rewritten in-place by at least one of those two substitution passes, so the pattern isn't the same the second time around and no longer matches.