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From: stephane@chazelas.org
To: Peter Stephenson <p.w.stephenson@ntlworld.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Extending regexes
Date: Wed, 06 Jul 2022 19:40:01 +0100	[thread overview]
Message-ID: <f73d67233f9db547c055a461d8d7255d@chazelas.org> (raw)
In-Reply-To: <76883431.1281129.1656942459330@mail2.virginmedia.com>

FWIW, ast's extended and augmented regexps as supported by ksh93's [[ =~ 
]] operator or more generally in globs after ~(E) (extended) ~(A) 
(augmented) do have AND and NOT operator.

That's \& and \! in ERE and & and ! in ARE.

ere() ksh -c '[[ $1 =~ $2 ]]' ksh "$@"
are() ksh -c '[[ $1 =~ (?A)$2 ]]' ksh "$@"

And then you can do

ere x '^([[:lower:]]\&.)$'
ere y '^x\!$'

are x '^([[:lower:]]&.)$'
are y '^x!$'

Also note that AND(A,B) can be done with NOT(OR(NOT(A), NOT(B))) so even 
ksh88 or bash can do AND in their globs (with extglob in bash) with 
!(!(A)|!(B))

-- 
Stephane



  parent reply	other threads:[~2022-07-06 18:45 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-04 12:03 Sebastian Gniazdowski
2022-07-04 13:47 ` Peter Stephenson
2022-07-04 19:15   ` Bart Schaefer
2022-07-04 19:41     ` Peter Stephenson
2022-07-06 10:03       ` Daniel Shahaf
2022-07-06 18:40   ` stephane [this message]
2022-07-06 23:07 ` Phil Pennock
2022-07-07  0:22   ` Bart Schaefer

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