$ perl -Mstrict -Mwarnings -le '
    my $cell = <<EOD;
<td>
1. Network-Time, Protocol: TCP, Source Port: 0-65535, Destination Port: 13-13
2. Network-Time-1, Protocol: UDP, Source Port: 0-65535, Destination Port: 13-13
3. Network-Time-2, Protocol: TCP, Source Port: 0-65535, Destination Port: 37-37
4. Network-Time-3, Protocol: UDP, Source Port: 0-65535, Destination Port: 37-37
5. Network-Time-4, Protocol: UDP, Source Port: 0-65535, Destination Port: 123-123
</td>
EOD

    my $re = qr{Protocol:\s+(\w+).*?Destination Port:\s+(\S+)}m;
    my @extract;
    push @extract, join(":", $1, $2) while $cell =~ /$re/g;
    print "@extract";
'
TCP:13-13 UDP:13-13 TCP:37-37 UDP:37-37 UDP:123-123