Question

How to check if a string contains only English letters in C++

Answer 1

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

bool is_only_english_letters(const std::string& s) {
    std::regex pattern("^[a-zA-Z]+$");
    
    return std::regex_match(s, pattern);
}

int main() {
    std::string s1 = "CPP";
    std::cout << is_only_english_letters(s1) << std::endl;

    std::string s2 = "CPPプログラミング";
    std::cout << is_only_english_letters(s2) << std::endl;
}


/*
run:

1
0

*/

 

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