c ++正则表达式模式来检查文件扩展名

Question

I want to check if a string ends with .h5 and tried the c++ regex class. But for any Input the regex_search function returns false. Other examples in the internet looks similar to my code below, so I do not understand whats going wrong.

What is wrong with my code? Thanks for any help.

#include <iostream>
#include <regex>
#include <string>

int main(int argc,char *argv[]){

  std::string text = argv[1];

  std::regex rx(".*\\.h5$");
  bool found = std::regex_search(text.c_str(),rx);

  std::cout << text << std::endl;
  std::cout << "res: " << found << std::endl;


}

Answer 1

What about using just substr ?

#include <string>

int main (int argc, char* argv[]) {
  std::string filename(argv[1]);
  std::string last = filename.substr(filename.length() - 3);

  return last == ".h5";
}

Answer 2

Replace regex_search with regex_match

std::regex rx(".*\\.h5$");
bool found = std::regex_match(argv[1], rx);
std::cout << "Result: " << std::boolalpha << found << std::endl;