> Rick Bragg wrote:
> > Hi,
> >
> > I want to write a script that will test the contents of a file.
> >
> > The file being tested will pass only if it contains nothing more
than an
> > ip address on one line. Does anyone have a sample of a simple regex to
> > accomplish this?
>
> /\d+\.\d+\.\d+\.\d+\n?/s
>
Beware of insufficient regexes in regex clothing. The above will
certainly find one or more digits followed by a dot, followed by one or
more digits followed by a dot, etc. But it does *NOT* match an IP
address...
/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/
Is at least closer, but it is still not sufficient, as IP addresses are
bounded, I believe, at 255 so 336.47.894.0, will match the above, but is
not a valid IP address.
How strict do you need to be, how sure are you about the data in the files?
http://danconia.org
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