From: Ralph Corderoy <ralph@inputplus.co.uk>
To: Computer Old Farts Followers <coff@tuhs.org>
Subject: [COFF] Re: Grep has gone overboard
Date: Mon, 30 May 2022 08:38:10 +0100 [thread overview]
Message-ID: <20220530073810.C112921F8A@orac.inputplus.co.uk> (raw)
In-Reply-To: <alpine.BSF.2.21.9999.2205301356510.35567@aneurin.horsfall.org>
Hi Dave,
> I'm trying to find a regex i.e. as used by GREP to find all words in
> "badugly" with each letter used only once and all are 7-letter words i.e.
> they are all anagrams
I tend to use egrep(1), as that's what my ~/bin/g runs, but sticking
with grep and its Basic Regular Expressions, as asked, I'd use
$ grep -v '[^badugly]' /usr/share/dict/words |
> grep '^.\{7\}$' |
> grep -v '\(.\).*\1'
ladybug
$
Note that uses my locale.
Section 9 of POSIX has the detail, https://pubs.opengroup.org/onlinepubs/9699919799/.
> I'll guess that it involves some obscure use of "{}*\" etc, which I've
> never really grokked...
If you want it explained on the list, let me know.
--
Cheers, Ralph.
next prev parent reply other threads:[~2022-05-30 7:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-30 4:12 [COFF] " Dave Horsfall
2022-05-30 4:47 ` [COFF] " Bakul Shah
2022-05-30 6:35 ` Michael Kjörling
2022-05-30 6:51 ` Bakul Shah
2022-05-30 8:26 ` Ralph Corderoy
2022-05-30 8:01 ` Ralph Corderoy
2022-05-30 8:16 ` Ralph Corderoy
2022-05-30 8:43 ` Bakul Shah
2022-05-30 9:19 ` Ralph Corderoy
2022-05-30 7:38 ` Ralph Corderoy [this message]
2022-05-30 7:44 ` Ralph Corderoy
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