re Challenge: More Compact?

Remco Gerlich scarblac at pino.selwerd.nl
Mon Jul 16 12:49:10 CEST 2001


Marcin 'Qrczak' Kowalczyk <qrczak at knm.org.pl> wrote in comp.lang.python:
> Sun, 15 Jul 2001 21:36:22 -0400, Tim Peters <tim.one at home.com> pisze:
> 
> > def valid_ip(ip):
> >     m = re.match(r'(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$', ip)
> >     if m:
> >         elements = map(int, m.groups())
> >         return max(elements) < 256
> >     return 0
> 
> Is 0127.0.0.00001 a valid IP?
> 
> If yes, then it should be accepted. If no, what about 127.0.0.001?

Many POSIX inet_aton implementations interpret '0127' as an octal, but
that's nonstandard behavior. I don't think IP number syntax is defined very
well.

(from a quick scan of some rfcs, ie rfc 820 and rfc 2553).
-- 
Remco Gerlich



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