How to do region syntax and avoid the effect of keywords.

Hi, everyone.

I want to let vim use syntax to fold c's function in K&R like.

int main()
{
return 0;
}

So I write this:

syntax region function start='^\h\+\_.\{-}\n\_^\ze{' end="}"
contains=ALLBUT,cCurlyError,@cParenGroup,cErrInParen,cCppParen,cErrInBracket,cCppBracket,cCppString,@Spell
fold keepend

But I find that the "int" on the beginning of the file will stop this
syntax rule become effective. If I change "int main" to "aint main",
everything is OK. How to deal with this problem?

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