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 <string>
#include <iostream>
#include <algorithm>
using namespace std;
bool nocase_compare (char c1, char c2)
{
return toupper(c1) == toupper(c2);
}
int main()
{
string s1("This is a string");
string s2("STRING");
// compare case insensitive
if (s1.size() == s2.size() && // ensure same sizes
equal (s1.begin(),s1.end(), // first source string
s2.begin(), // second source string
nocase_compare)) { // comparison criterion
cout << "the strings are equal" << endl;
}
else {
cout << "the strings are not equal" << endl;
}
// search case insensitive
string::iterator pos;
pos = search (s1.begin(),s1.end(), // source string in which to search
s2.begin(),s2.end(), // substring to search
nocase_compare); // comparison criterion
if (pos == s1.end()) {
cout << "s2 is not a substring of s1" << endl;
}
else {
cout << '"' << s2 << "\" is a substring of \""
<< s1 << "\" (at index " << pos - s1.begin() << ")"
<< endl;
}
}