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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5.4 Alle Wörter außer einem bestimmten finden
Problem
Sie wollen einen regulären Ausdruck verwenden, um ein beliebiges vollständiges Wort zu finden – außer rot. Rotieren und andere Wörter, die die Buchstabenkombination „rot“ enthalten, sollen gefunden werden – eben nur nicht rot.
Lösung
Ein negatives Lookahead kann dabei helfen, bestimmte Wörter auszuschließen. In dieser Regex ist es das Schlüsselelement:
\b(?!rot\b)\w+
Regex-Optionen: Groß-/Kleinschreibung wird ignoriert
Regex-Varianten: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby
Diskussion
Auch wenn es mit einer negierten Zeichenklasse (geschrieben als ‹[^...]›) leicht ist, alles bis auf ein bestimmtes Zeichen zu finden, können Sie nicht einfach ‹[^rot]› schreiben, um alles außer dem Wort rot ...
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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.