From: Roman Perepelitsa <roman.perepelitsa@gmail.com>
To: Ray Andrews <rayandrews@eastlink.ca>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: [[ 'abcde' =~ (#i)Bcd ]]
Date: Mon, 7 Nov 2022 22:26:40 +0100 [thread overview]
Message-ID: <CAN=4vMoJNYik=AGE4G201Qa7K_qDMTJN91xEb_thxc5i8vpwCw@mail.gmail.com> (raw)
In-Reply-To: <9bc02014-76ca-b2c0-5f7c-284b90884225@eastlink.ca>
On Mon, Nov 7, 2022 at 10:11 PM Ray Andrews <rayandrews@eastlink.ca> wrote:
>
>
> [[ 'abcde' =~ 'bcd' ]] && echo match1
> [[ 'abcde' = (#i)ABcde ]] && echo match2
> [[ 'abcde' =~ (#i)Bcd ]] && echo match3
> [[ 'bcd' =~ 'abcde' ]] && echo match4
>
> ... I get match 1 and match 2. I understand not getting match 4
> because '=~' is not bi-directional, the latter value must be a subset of
> the former. But why don't I get match 3?
Does it surprise you that this also doesn't match?
[[ 'a' =~ (#i)A ]]
(#i) only works with pattern matching. For regex the easiest
workaround is to convert left-hand-side to lowercase:
foo=XaBcX
[[ ${(L)foo} =~ abc ]] && echo match
Another option is to use zsh/pcre module. See
https://zsh.sourceforge.io/Doc/Release/Zsh-Modules.html#The-zsh_002fpcre-Module.
In this specific case it's better to use pattern matching of course:
[[ $foo == (#i)*abc* ]] && echo match
I find it extremely rare in practice that I need a regex match in zsh.
Roman.
next prev parent reply other threads:[~2022-11-07 21:28 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-07 21:10 Ray Andrews
2022-11-07 21:26 ` Roman Perepelitsa [this message]
2022-11-07 21:47 ` Ray Andrews
2022-11-07 22:15 ` Lawrence Velázquez
2022-11-08 1:57 ` Ray Andrews
2022-11-07 21:50 ` Lawrence Velázquez
2022-11-08 2:05 ` Ray Andrews
2022-11-08 8:19 ` Roman Perepelitsa
2022-11-08 13:32 ` Ray Andrews
2022-11-08 14:37 ` Roman Perepelitsa
2022-11-08 14:30 ` Ray Andrews
2022-11-08 17:40 ` Phil Pennock
2022-11-08 18:43 ` Ray Andrews
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