Question

How to validate a 10-digit standard 10 digit phone number using RegEx in C++

Answer 1

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

int main() {
    std::string phone_number = "333-555-1234";
    std::regex phone_regex(R"((\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}$)");

    if (std::regex_match(phone_number, phone_regex)) {
        std::cout << "Valid phone number format" << std::endl;
    } else {
        std::cout << "Invalid phone number format" << std::endl;
    }
    
    phone_number = "(333)-555-1234";
    if (std::regex_match(phone_number, phone_regex)) {
        std::cout << "Valid phone number format" << std::endl;
    } else {
        std::cout << "Invalid phone number format" << std::endl;
    }
    
    phone_number = "333 555 1234";
    if (std::regex_match(phone_number, phone_regex)) {
        std::cout << "Valid phone number format" << std::endl;
    } else {
        std::cout << "Invalid phone number format" << std::endl;
    }
    
    phone_number = "333.555.1234";
    if (std::regex_match(phone_number, phone_regex)) {
        std::cout << "Valid phone number format" << std::endl;
    } else {
        std::cout << "Invalid phone number format" << std::endl;
    }
    
    phone_number = "+91 (333) 555-1234";
    if (std::regex_match(phone_number, phone_regex)) {
        std::cout << "Valid phone number format" << std::endl;
    } else {
        std::cout << "Invalid phone number format" << std::endl;
    }
}


  
/*
run:
  
Valid phone number format
Valid phone number format
Valid phone number format
Valid phone number format
Valid phone number format
  
*/

 

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