#!/usr/bin/perl
my $line = "Dec  9 12:45:36 osboxes NetworkManager[739]: <info>   address 192.168.10.129";
if ((my $date) = $line =~  m/([A-Z]+\s{2}\d+\s(?:\d{2}:){2}\d{2})/i)
{   
  print $date;
}