c++ - Case insensitive string::find -

is there exist case insensitive find() method std::string?

you upper-case both strings , use regular find. (note: approach may not correct if have unicode string.)

in boost there's ifind_first case-insensitive search. (note returns range instead of size_t).

#include <string> #include <boost/algorithm/string/find.hpp> #include <cstdio> #include <cctype>  std::string uppercase(std::string input) {   (std::string::iterator = input.begin(); != input.end(); ++ it)     *it = toupper(*it);   return input; }  int main () {   std::string foo = "1 foo 2 foo";   std::string target = "foo";    printf("string.find: %zu\n", foo.find(target));    printf("string.find w/ uppercase: %zu\n", uppercase(foo).find(uppercase(target)));    printf("ifind_first: %zu\n", boost::algorithm::ifind_first(foo, target).begin() - foo.begin());    return 0; }