Yes.The second is right.
first you must know \\ = \ in substitude and match.
like this : \\\\ is match \\. and \\ is match \.
\%(\\\)\@<!\\\%(\\\)\@!
you can split it to three part :
\%(\\\)\@<!
\%(\\\)\@!
it match "\",and this "\" havn't "\" before and follow it .
you can read the vim help.there are some examples.
:h :s
:h \@<!
:h \@!
2011-01-26
ifys0325
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