Thanks for the suggestions.

I switched my join statement to use concatenation but it is giving the same output.

Switching while(<@check>) with for(@check) does not match anything as the script now returns no interfaces. Do I now need to change how I am checking for the patterns within @check?

Updated code and script output below:

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^\G[0-9]/[0-9]/[0-9]^)
        {
            $interface = $_;
            $T1Count++;
            $T1List = $T1List . $interface . "\n";
        }
        # check if the interface is a PRI (pri-group timeslots 1-24)
        if (m^\Gpri-group^)
        {
            $PRICount++;
            $PRIList = $PRIList . $interface . "\n";
        }            
    }

    if ($T1Count > 0)
    {
        print "T1 Controller Summary:\n\n";
        print "$T1Count total T1 interfaces\n";
        print $T1List;
        print "$PRICount total voice PRI(s)\n";
        print $PRIList;
    }
    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

No T1 interfaces found
[download]

Thanks again for your help

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