# Example lines:
# 1     1 ms     *        1 ms  192.168.1.1 
# 2    14 ms     8 ms     9 ms  73.220.38.1 

my $destn_re = qr! ^                                # start of line
                   \s* \d+ \s+ ms                   # 14 ms
                   (?:                              # EITHER
                       (?: \d+ ms )                 #   8 ms
                    |                               # OR
                    \*                              #   *
                   )
                   \s+ \d+ \s+ ms                   # 9 ms
                   \s+ (?: \d{1,3} \. ){3} \d{1,3}  # IP address: 192.168.1.1
                   $                                # end of line
                 !x;