How do I make vim highlight any { not followed by either a C++ style comment, or two newlines?

I would like to create a match pattern for any opening brace that does not follow one of these patterns:

1. {\n\n
2. {\s*\/\/.*\n\(\s*\/\/.*\)\?\n

The more general problem is highlighting violations of a coding spec at work, which enforces a blank line following {

Clarification, I'm looking for this to catch code like the following:

if (foo) {
    this_is_bad____no_blank_line_above();
} else {this_is_worse();}

while (1) {  //This comment is allowed
             //This one too
    theres_nothing_wrong_with_this();
}

if (foo) {
    ....//<-- Ideally we could mark this as bad, due to the spaces here
    otherwise_perfectly_good();
}

What I really need is: {\(\n\n\|\s*\/\/.*\n\(\s*\/\/.*\)\?\n\)\!

Where the made-up symbol \! means "Does not matc开发者_开发技巧h either of these two options". I see a way of doing that for individual characters, but not for a longer string.

Found it:

I was looking for \@!

Documented at :h /\@!

{\(\n\n\|\s*\/\/.*\n\(\s*\/\/.*\)\?\n\)\@!

Add the following to the end of your .vimrc file:

:highlight InvalidStyle ctermbg=red guibg=red ctermfg=black guifg=black
:match InvalidStyle /{\s*[^\t \/]\+.*$/

The first line defines a new highlight style (black on red) and the next line tries to find any curly braces that have content after them which aren't comments and applies the highlighting on them.