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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8.10 Ändern der Feldbegrenzer in CSV-Dateien
Problem
Sie wollen in einer CSV-Datei alle Kommata als Feldbegrenzer durch Tabs austauschen. Kommata innerhalb von Werten in doppelten Anführungszeichen sollen bestehen bleiben.
Lösung
Der folgende reguläre Ausdruck findet ein einzelnes CSV-Feld zusammen mit seinem davorstehenden Begrenzungszeichen. Dieses Zeichen ist normalerweise ein Komma, es kann sich aber auch um einen leeren String handeln, wenn das erste Feld des ersten Datensatzes gefunden wird, oder um einen Zeilenumbruch, wenn man das erste Feld eines der folgenden Datensätze erreicht. Jedes Mal, wenn eine Übereinstimmung gefunden wurde, wird das Feld selbst, zusammen mit den doppelten Anführungszeichen, die es eventuell umgeben, in Rückwärtsreferenz ...
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