From: Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: count matches in string, not region?
Date: Wed, 26 Feb 2020 22:22:14 +0100 [thread overview]
Message-ID: <875zftdoxl.fsf@ebih.ebihd> (raw)
In-Reply-To: 009f6fb0-8191-48f5-8541-52d95cfecd83@beta.fastmail.com
Tassilo Horn wrote:
> Another way would be
>
> (string-match-p "^[[:digit:]]\\{13\\}$" isbn)
>
> which returns non-nil iff isbn is a string of
> exactly thirteen digits.
Okay ... another way of doing ...?
Here is an example of an ISBN-10:
0-13-308504-X
and here is an ISBN-13:
978-91-0-011493-0
the check digit is the last one (X meaning 10,
and 0, respectively), so actually one only
needs 9 digits in the first case and 12 in
the second, to compute the check digit.
The groupings (...-...-...-...) do mean things
<https://dataswamp.org/~incal/books/isbn.txt>
but not with respect to how the check digit is
computed, so one can just drop dashes and all
chars that aren't digits.
More examples in the old file,
https://dataswamp.org/~incal/emacs-init/isbn-verify.el
Thanks for the mail tho, I really want to close
the BOOK on this, so fire away all suggestion
you have :)
--
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal
prev parent reply other threads:[~2020-02-26 21:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 4:29 count matches in string, not region? Emanuel Berg via Users list for the GNU Emacs text editor
2020-02-26 4:48 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-02-26 5:04 ` `string-to-number' 0 (was: Re: count matches in string, not region?) Emanuel Berg via Users list for the GNU Emacs text editor
2020-02-26 6:13 ` string to digits only (was: Re: `string-to-number' 0 (was: Re: count matches in string, not region?)) Emanuel Berg via Users list for the GNU Emacs text editor
2020-02-26 7:37 ` `string-to-number' 0 VanL
2020-02-26 8:44 ` Emanuel Berg
2020-02-26 6:24 ` count matches in string, not region? Emanuel Berg via Users list for the GNU Emacs text editor
2020-02-26 19:49 ` Tassilo Horn
2020-02-26 21:22 ` Emanuel Berg via Users list for the GNU Emacs text editor [this message]
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