#include <iostream>
#include <regex>
int main() {
std::regex pattern("b.d");
std::cout << std::regex_match("bud", pattern) << std::endl;
std::cout << std::regex_match("bid", pattern) << std::endl;
std::cout << std::regex_match("bed", pattern) << std::endl;
std::cout << std::regex_match("b d", pattern) << std::endl;
std::cout << std::regex_match("bat", pattern) << std::endl;
std::cout << std::regex_match("bd", pattern) << std::endl;
std::cout << std::regex_match("bead", pattern) << std::endl;
}
/*
run:
1
1
1
1
0
0
0
*/