The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include <iostream>
#include <algorithm>
#include <locale>
#include <string>
using namespace std;
char myToupper (char c)
{
std::locale loc;
return std::use_facet<std::ctype<char> >(loc).toupper(c);
}
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
[] (char c1, char c2) { // compar. criterion
return myToupper(c1)==myToupper(c2);
});
if (pos != s.end()) {
cout << "\"" << sub << "\" is part of \"" << s << "\""
<< endl;
}
}