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From: Ralph Corderoy <ralph@inputplus.co.uk>
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Subject: [COFF] Re: Grep has gone overboard
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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.