G'day clegane,

This appears to do what you want:

$ 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 Po
+rt: 13-13
3. Network-Time-2, Protocol: TCP, Source Port: 0-65535, Destination Po
+rt: 37-37
4. Network-Time-3, Protocol: UDP, Source Port: 0-65535, Destination Po
+rt: 37-37
5. Network-Time-4, Protocol: UDP, Source Port: 0-65535, Destination Po
+rt: 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
[download]

Notes:

• The 'm' modifier says the data is multiline.
• The '.*?' handles the greediness issue.
• I don't know what "$htmlStream->get_trimmed_text('/td')" does. It may be removing leading and trailing whitespace from each cell; it may be removing the '<td>' and '</td>' tags; it may be doing both of those; it may be doing something else. Regardless, it might be unnecessary with the solution I've provided: I added the tags to the test data to show this can handle an entire, multiline "<td>...</td>" block.