Perl Guru Forums: Perl Programming Help: Regular Expressions: Extracting an IPv4 address from line

CGI/Perl Guide | Learning Center | Forums | Advertise | Login

Site Search: in


	MAIN INDEX	SEARCH POSTS	WHO'S ONLINE	LOG IN

Home: Perl Programming Help: Regular Expressions:
Extracting an IPv4 address from line

mant1s
New User

Jul 5, 2011, 2:01 PM

Post #1 of 3 (5987 views)

Extracting an IPv4 address from line	Can't Post

Hi All,

I'm wondering what I should do to extract the second IP address from a log file I have. My log file looks like:

Code

[03072011 13:32:01] connection connection.c:3880-message: connection 0x8fa0fe0 accept/tcp/none [130.55.252.94:21->184.105.172.67:34627] state: none->established

I only want to snag the address 184.105.172.67. Currently I'm using the following function to narrow it down but it doesn't seem to be working. Any pointers!?

Code

##Loop to extract the ips 
	foreach(@msg3880) 
	{ 
		my ($selected) = $_; 
		if ($selected =~ m/^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})/) 
		{ 
			 my $ip = $1 << 24 | $2 << 16 | $3 << 8 | $4; 
			 print $ip; 
		} 
	}

Note @msg3880 is an array that holds all the lines above. Any help would be appreciated!

BillKSmith
Veteran

Jul 5, 2011, 8:53 PM

Post #2 of 3 (5977 views)

Re: [mant1s] Extracting an IPv4 address from line [In reply to]	Can't Post

You are looking for the address at the start of the line. It is not there so no match. Replace "^" with "->" to look for the address immediately after the "arrow".

Perl's bit-wise OR ("|") probably does not do what you expect. Refer to the paragraph "Bitwise Or and Exclusive Or" (and its rererences) in perldoc perlop.
Good Luck,
Bill

miller
User

Jul 7, 2011, 3:07 PM

Post #3 of 3 (5927 views)

Re: [mant1s] Extracting an IPv4 address from line [In reply to]	Can't Post

use Regexp::Common qw(net);

- Miller

Search for (options)

Web Applications & Managed Hosting Powered by Gossamer Threads
Visit our Mailing List Archives