Filename from path

#include <string>

int main() {
  std::string filename = "C:\\MyDirectory\\MyFile.bat";
  const size_t last_slash_idx = filename.find_last_of("\\/");
  if (std::string::npos != last_slash_idx) {
    filename.erase(0, last_slash_idx + 1);
  }
  const size_t period_idx = filename.rfind('.');
  if (std::string::npos != period_idx) {
    filename.erase(period_idx);
  }
  return 0;
}