Hi All, It's working! :)

The \G modifier was preventing the subsuequent matches. I had included it because to my understanding it would allow the next m// to start where the previous had left off, but I guess that only applies if you are also using the global match operator \g. Once that was removed I just had to make a few tweaks to get the output formatted the way I wanted.

Here is the working code and output:

use Net::Ping;
use Net::Telnet::Cisco;
use Getopt::Long;

my $host = "";
my $interface = "";
my $PRIList = "";
my $T1List = "";
my $T1Count = 0;
my $PRICount = 0;

GetOptions("host:s"    => \ $host);

if (!$host)
{
    print "usage: perl regexp_test.pl --host=(IPAddress)";
    exit;
}

my $p = Net::Ping->new();
if ($p->ping($host))
{
    print "\nDevice is online, connecting...\n\n";
    my $session = Net::Telnet::Cisco->new(Host => $host);
    $session->login('user', 'password');
    
    $session->cmd("term len 0");
    
    print "Retrieving T1 controller details...\n\n";
    my @check = $session->cmd("sh run | s controller T1");
    print "@check\n";
    
    for(@check)
    {
        # match an interface number e.g. 0/0/0, 0/1/0, etc
        if (m^([0-9]/[0-9]/[0-9])^)
        {
            $interface = $1;
            $T1Count++;
            $T1List = $T1List . $interface . "\n";
        }
        # check if the interface is a PRI (pri-group timeslots 1-24)
        if (m^pri-group^)
        {
            $PRICount++;
            $PRIList = $PRIList . $interface . "\n";
        }            
    }

    if ($T1Count > 0)
    {
        print "T1 Controller Summary:\n\n";
        print "$T1Count total T1 interfaces\n";
        print "$T1List\n";
        print "$PRICount total voice PRI(s)\n";
        print "$PRIList\n";
    }
    else
    {
        print "No T1 interfaces found";
    }

    $session->close;
}
else
{
    print "\nDevice OFFLINE!!  Connection aborted!!\n\n";
}
$p->close();
[download]

C:\perl scripts>perl regexp_test.pl --host 10.22.49.19

Device is online, connecting...

Retrieving T1 controller details...

controller T1 0/0/0
  framing esf
  linecode b8zs
  cablelength long 0db
  pri-group timeslots 1-24
 controller T1 0/0/1
  framing esf
  linecode b8zs
  cablelength long 0db
 controller T1 0/1/0
  framing esf
  linecode b8zs
  cablelength long 0db
 controller T1 0/1/1
  framing esf
  linecode b8zs
  cablelength long 0db

T1 Controller Summary:

4 total T1 interfaces
0/0/0
0/0/1
0/1/0
0/1/1

1 total voice PRI(s)
0/0/0
[download]

Thanks everyone for your help, greatly appreciated!

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