Case insensitive std::string.find()

Question

I am using std::string\'s find() method to test if a string is a substring of another. Now I need case insensitive version of the same thing. For s

Answer 1

The new C++11 style:

#include 
#include 
#include 

/// Try to find in the Haystack the Needle - ignore case
bool findStringIC(const std::string & strHaystack, const std::string & strNeedle)
{
  auto it = std::search(
    strHaystack.begin(), strHaystack.end(),
    strNeedle.begin(),   strNeedle.end(),
    [](char ch1, char ch2) { return std::toupper(ch1) == std::toupper(ch2); }
  );
  return (it != strHaystack.end() );
}

Explanation of the std::search can be found on cplusplus.com.