c++ boost find substring case insensitive code example

Example: wstring find case insensitive

#include <string>
#include <iostream>
#include <algorithm>
#include <iterator>
#include <cctype>

using namespace std;

inline bool caseInsCharCompSingle(char a, char b) {
   return(toupper(a) == b);
}

string::const_iterator caseInsFind(string& s, const string& p) {
   string tmp;

   transform(p.begin(), p.end(),             // Make the pattern
             back_inserter(tmp),                 // upper-case
             toupper);

   return(search(s.begin(), s.end(),         // Return the iter- 
                 tmp.begin(), tmp.end(),     // ator returned by
                 caseInsCharCompSingle));        // search
}

int main() {
   string s = "row, row, row, your boat";
   string p = "YOUR";
   string::const_iterator it = caseInsFind(s, p);

   if (it != s.end()) {
      cout << "Found it!\n";
   }
}