Function onig_regset_search

pub unsafe extern "C" fn onig_regset_search(
    set: *mut OnigRegSet,
    str: *const OnigUChar,
    end: *const OnigUChar,
    start: *const OnigUChar,
    range: *const OnigUChar,
    lead: OnigRegSetLead,
    option: OnigOptionType,
    rmatch_pos: *mut c_int,
) -> c_int