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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4.4 Klassische Datumsformate validieren
Problem
Sie wollen Datumswerte in den klassischen Formaten mm/dd/yy, mm/dd/yyyy, dd.mm.yy und dd.mm.yyyy validieren. Dafür wollen Sie eine einfache Regex verwenden, die nur prüft, ob ein Wert wie ein Datum aussieht, ohne aber ungültige Datumswerte wie den 31. Februar zu erkennen.
Lösung
Finden eines dieser Datumsformate, wobei führende Nullen weggelassen werden dürfen:
^[0-3]?[0-9][/.][0-3]?[0-9][/.](?:[0-9]{2})?[0-9]{2}$Regex-Optionen: Keine
Regex-Varianten: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby
Finden eines dieser Datumsformate, wobei führende Nullen vorhanden sein müssen:
^[0-3][0-9][/.][0-3][0-9][/.](?:[0-9][0-9])?[0-9][0-9]$
Regex-Optionen: Keine
Regex-Varianten: .NET, Java, JavaScript, PCRE, Perl, ...
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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.