syntax highlighting for IPv6 in resolv.conf (resolv.vim)

I really don't understand vim syntax highlighting at all. This works, but I wanted to run it by somebody who actually does. I blatantly stole the additional regex from bindzone.vim, but I've no idea what the contains=@reolvIPCluster bit does in the original or whether I broke anything. It _seems_ to work fine. The fact that it went unresolved for several years combined with it only taking a few minutes of discovery to fix is what concerns me. Is there anything wrong with the below snippet (the first and last match are from the shipped resolv.vim)?

...

" Particular

syn match resolvIPNameserver contained /\%(\%(\d\{1,4}\.\)\{3}\d\{1,4}\%(\s\|$\)\)\+/ contains=@resolvIPCluster

syn match resolvIPNameserver contained /\<\(\x\{1,4}:\)\{6}\(\x\{1,4}:\x\{1,4}\)\>/

syn match resolvIPNameserver contained /\s\@<=::\(\(\x\{1,4}:\)\{,6}\x\{1,4}\)\>/

syn match resolvIPNameserver contained /\<\(\x\{1,4}:\)\{1}:\(\(\x\{1,4}:\)\{,5}\x\{1,4}\)\>/

syn match resolvIPNameserver contained /\<\(\x\{1,4}:\)\{2}:\(\(\x\{1,4}:\)\{,4}\x\{1,4}\)\>/

syn match resolvIPNameserver contained /\<\(\x\{1,4}:\)\{3}:\(\(\x\{1,4}:\)\{,3}\x\{1,4}\)\>/

syn match resolvIPNameserver contained /\<\(\x\{1,4}:\)\{4}:\(\(\x\{1,4}:\)\{,2}\x\{1,4}\)\>/

syn match resolvIPNameserver contained /\<\(\x\{1,4}:\)\{5}:\(\(\x\{1,4}:\)\{,1}\x\{1,4}\)\>/

syn match resolvIPNameserver contained /\<\(\x\{1,4}:\)\{6}:\x\{1,4}\>/

syn match resolvIPNameserver contained /\<\(\x\{1,4}:\)\{1,7}:\(\s\|;\|$\)\@=/

syn match resolvHostnameSearch contained /\%(\%([-0-9A-Za-z_]\+\.\)*[-0-9A-Za-z_]\+\.\?\%(\s\|$\)\)\+/

...

This or similar needs to be added to resolv.vim upstream, but figured I'd post in the user forum for a sanity check first.

Thanks in advance.

--DJ

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