June 2005
Intermediate to advanced
794 pages
18h 27m
German
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16.7 Text innerhalb von HTML-Tags finden
Problem
Sie möchten Text auslesen, der sich innerhalb von HTML-Tags befindet. Zum Beispiel möchten Sie alle Überschriften in einem HTML-Dokument finden.
Lösung
Lesen Sie die HTML-Datei in einen String ein und führen Sie nicht-gieriges Matching mit Ihrem Muster durch:
$html = join('',file($file));
preg_match('#<h([1-6])>(.+?)</h\1>#is', $html, $matches);In diesem Beispiel enthält $matches[2] ein Array mit den ausgelesenen Überschriften.
Diskussion
Es ist schwierig, HTML-Code mit einfachen regulären Ausdrücken korrekt zu analysieren. Einer der Vorteile von XHTML ist, dass es deutlich einfacher zu validieren und zu zerlegen ist.
Zum Beispiel ist das Muster in der Lösung so intelligent, dass es zueinander passende ...
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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.