December 2009
Intermediate to advanced
560 pages
15h 5m
German
Content preview from Reguläre Ausdrücke KochbuchBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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4.13 ISBN validieren
Problem
Sie müssen die Gültigkeit einer International Standard Book Number (ISBN) prüfen. Diese kann entweder im älteren ISBN-10- oder im aktuellen ISBN-13-Format vorliegen. Am Anfang soll optional eine ISBN-Kennung stehen, zudem können die Teile der ISBN optional durch Bindestriche oder Leerzeichen getrennt sein. ISBN 978-0-596-52068-7, ISBN-13: 978-0-596-52068-7, 978 0 596 52068 7, 9780596520687, ISBN-10 0-596-52068-9 und 0-596-52068-9 sind allesamt Beispiele für gültige Eingaben.
Lösung
Sie können eine ISBN nicht allein mit einer Regex validieren, da die letzte Ziffer mit einem Prüfsummenalgorithmus berechnet wird. Die regulären Ausdrücke in diesem Abschnitt überprüfen das Format einer ISBN, während die folgenden Codebeispiele ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.