Ken,
Your code will match any valid ip address, plus a bunch of addresses that
are not valid,
Try it with: 111.222.333.444
But I think that keeping in Brian's original question, it doesn't matter.
He is probably parsing the output of some program that is giving him a valid
ip, so you code will work just fine.
Jason
-----Original Message-----
From: Ken [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 14, 2001 11:46 AM
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
> >
> >
>
>
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