December 2009
Intermediate to advanced
560 pages
15h 5m
German
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7.16 IPv4-Adressen finden
Problem
Sie wollen prüfen, ob ein bestimmter String aus einer gültigen IPv4-Adresse in der Notation 255.255.255.255 besteht. Optional wollen Sie diese Adresse auch noch in eine 32-Bit-Integer-Zahl umwandeln.
Lösung
Regulärer Ausdruck
Einfache Regex, mit der eine IP-Adresse geprüft wird:
^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$Regex-Optionen: Keine
Regex-Varianten: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby
Exakte Regex, mit der eine IP-Adresse geprüft wird:
^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}
(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$Regex-Optionen: Keine
Regex-Varianten: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby ...
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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.