Find the specified substring and intercept for C++ Chinese-English mixed strings

C++ mixed string intercepting

So far, s.ind(str) always returns -1. Intercepting after eight bits with s.ubstr(idx) results in an error

#include<iostream>
#include<string>
#include<regex>
#include<cstdlib>
#include< locale>
#include <codecvt>
using namespace std;
void cut(wstring a) {
    wstring next;
    wstring h = L"荣耀";
    int head,end;
    wregex regexstr(L"^0.*");   //输入多行字符串处理，直到输入一个以0开头的字符串结束。
    wsmatch resault;
    if (regex_match(a, resault, regexstr)) cout<<"back"<<endl;
    else {
        getline(wcin, next);
        cut(next);        //用递归实现处理完一并输出
    }
    head = a.find(h);   //返回值恒为-1
    if(head>0)
        wcout<<a.substr(head)<<endl;     //只有把head改成具体值(<=8)可以截取
}
int main()
{
    wstring a;
    getline(wcin,a);
    cut(a);
}

Just learn c++, at the beginning string can not handle Chinese characters to wstring, want to get the specified string position before intercepting, but s.ind and s.ubstr now have problems, please save!!