objc2_core_foundation

Function CFStringFindWithOptions

Source 
pub unsafe extern "C-unwind" fn CFStringFindWithOptions(
    the_string: &CFString,
    string_to_find: Option<&CFString>,
    range_to_search: CFRange,
    search_options: CFStringCompareFlags,
    result: *mut CFRange,
) -> bool
Available on crate features CFBase and CFString only.