Function looks_like_cpp_option_code 

pub fn looks_like_cpp_option_code(code: &str) -> bool

Exact POSIX ERE used by C++ IsOptionCode.

Ref: NNBase_Define_Inline.h:241-263: ^[\._0-9A-Za-z]+[0-9]{6}[PpCc][0-9]{2,}$.