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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4.10 Die Zeilenanzahl eines Texts beschränken
Problem
Sie müssen prüfen, ob ein String aus fünf oder weniger Zeilen besteht, wobei die Gesamtlänge des Strings unwichtig ist.
Lösung
Die Zeichen oder Zeichenfolgen, die als Zeilentrenner genutzt werden, können sehr stark von Ihrem Betriebssystem, der Anwendung oder den Einstellungen des Benutzers abhängig sein. Daher stellt sich beim Schaffen einer idealen Lösung die Frage, welche Konventionen unterstützt werden sollen, um den Anfang einer neuen Zeile zu erkennen. Die folgenden Lösungen unterstützen den Standard von MS-DOS/Windows (‹\r\n›), dem alten Mac OS (‹\r›) und Unix/Linux/OS X (‹\n›).
Regulärer Ausdruck
Die folgenden drei variantenspezifischen Regexes besitzen zwei Unterschiede. Die erste Regex ...
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