Well it would.
Run it with an 'IP' of 123.456.789.0. Still matches, right? But that's not a
valid IP.
It's a valid number if your looking for four groups of numbers, each no more
than 3 digits in length, seperated by a . (which is what your code does).
But it's not a test for a valid IP address.
John
-----Original Message-----
From: Ken [mailto:[EMAIL PROTECTED]]
Sent: 14 June 2001 16:46
To: John Edwards; [EMAIL PROTECTED]
Subject: Re: regex matching
Doesn't {1,3} mean minimum of 1 and maximum of 3 of whatever character comes
before the {}'s?
I ran this code with the following ip:
192.168.0.34
It works fine.
----- Original Message -----
From: "John Edwards" <[EMAIL PROTECTED]>
To: "'Ken'" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>
Sent: Thursday, June 14, 2001 9:40 AM
Subject: RE: regex matching
> "To just make sure what you have is an ip (and only an ip) is:
> m/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/;"
>
> Not true. An IP can only consist of numbers ranging from 0 to 255. Your
> example will match an 'IP' that looks like this;
>
> 311.497.999.587
>
> for instance.
>
> The example I gave isn't perfect (and I nicked the essentials of it from
the
> Perl Cookbook) but it will at least not match on completely wrong IPs.
>
> John
>
> -----Original Message-----
> From: Ken [mailto:[EMAIL PROTECTED]]
> Sent: 14 June 2001 16:32
> To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> Subject: Re: regex matching
>
>
> \d only matches one digit....here's a way to extract each number from an
ip:
> use strict;
> my( $ip );
> print "Enter a string with an IP:";
> $ip = <STDIN>;
> $ip =~ m/(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/;
> print "$1\n";
> print "$2\n";
> print "$3\n";
> print "$4\n";
>
> Or if you just want the ip from the line:
> use strict;
> my( $ip );
> print "Enter a string with an IP:";
> $ip = <STDIN>;
> $ip =~ m/(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/;
> print "The ip is: $1\n";
>
> To just make sure what you have is an ip (and only an ip) is:
> m/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/;
>
>
>
> ----- Original Message -----
> From: <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Thursday, June 14, 2001 9:12 AM
> Subject: regex matching
>
>
> > i have a basic knowledge of regex but i want to know if there is a
> > simpler way to pull patterns out of a line.
> >
> > if i have a line like:
> >
> > here is a sample with 123.456.123.456 in the middle.
> >
> > m/\d\.\d\.\d\.\d/ will match the entire line. is there an easy way to
> > get only the ip address?
> >
> > thanks..
> >
> > Brian T. Wallace
> > Engineer
> >
> >
>
>
> --------------------------Confidentiality--------------------------.
> This E-mail is confidential. It should not be read, copied, disclosed or
> used by any person other than the intended recipient. Unauthorised use,
> disclosure or copying by whatever medium is strictly prohibited and may be
> unlawful. If you have received this E-mail in error please contact the
> sender immediately and delete the E-mail from your system.
>
>
>
--------------------------Confidentiality--------------------------.
This E-mail is confidential. It should not be read, copied, disclosed or
used by any person other than the intended recipient. Unauthorised use,
disclosure or copying by whatever medium is strictly prohibited and may be
unlawful. If you have received this E-mail in error please contact the
sender immediately and delete the E-mail from your system.
