136.1.1.154:33672 ->  64.210.209.51:80 ->  192.168.1.145:80            tcp
 65.201.211.176:14664 ->  64.210.209.54:80 ->   192.168.1.78:80            tcp
    67.38.95.86:2116 ->  64.210.209.50:80 ->  192.168.1.103:80            tcp
 198.49.222.246:52469 ->  64.210.209.54:80 ->   192.168.1.79:80            tcp
 193.80.106.152:3781 ->  64.210.209.61:80 ->   192.168.1.81:80            tcp
    67.28.79.24:3248 ->  64.210.209.54:80 ->   192.168.1.79:80            tcp
 128.187.192.39:1218 ->  64.210.209.54:80 ->   192.168.1.78:80            tcp
 128.187.192.39:1209 ->  64.210.209.51:80 ->  192.168.1.144:80            tcp

##</code><code>##

my $re_ip = qr/(\d+\.\d+\.\d+\.\d+):\d+/;
my $re_line = qr/ ^ \s* $re_ip \s* -> \s* $re_ip \s* -> \s* $re_ip /x;

##</code><code>##

qr/^\s*$re_ip\s*->\s*$re_ip\s*->\s*$re_ip/

qr/^ \s* $re_ip\s*->\s*$re_ip\s*->\s*$re_ip/x

qr/^\s*$re_ip\s*-> \s* $re_ip\s*-> \s* $re_ip/x

qr/ ^ \s* $re_ip\s*->\s*$re_ip\s*->\s*$re_ip/x

##</code><code>##

qr/ ^ \s* $re_ip \s*->\s*$re_ip\s*->\s*$re_ip/x

qr/ ^ \s* $re_ip\s*->\s*$re_ip \s*->\s*$re_ip/x