string.find_first_not_of( substring )
#include <iostream> using std::cout; using std::endl; #include <string> using std::string; int main() { string string1( "This is a test string!"); int location; location = string1.find_first_not_of( "is" ); cout << "\n\n(find_first_not_of) '" << string1[ location ] << " " << location; return 0; } /* (find_first_not_of) 'T 0 */