The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference
by Nicolai M. Josuttis, Addison-Wesley, 1999
© Copyright Nicolai M. Josuttis 1999
#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <cctype>
#include "compose.hpp"
using namespace std;
using namespace boost;
int main()
{
string s("Internationalization");
string sub("Nation");
// search substring case insensitive
string::iterator pos;
pos = search (s.begin(),s.end(), // string to search in
sub.begin(),sub.end(), // substring to search
compose_f_gx_hy(equal_to<int>(), // compar. criterion
ptr_fun(::toupper),
ptr_fun(::toupper)));
if (pos != s.end()) {
cout << "\"" << sub << "\" is part of \"" << s << "\""
<< endl;
}
}