Question

How to check if a string contains only letters and numbers using RegEx in C++

Answer 1

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

bool isAlphanumeric(const std::string& str) {
    // Define the regular expression for alphanumeric characters
    std::regex alphanumericRegex("^[a-zA-Z0-9]+$");
    
    // Use std::regex_match to check if the string matches the pattern
    return std::regex_match(str, alphanumericRegex);
}

int main() {
    std::string str = "VuZ3q7J4wo35Pi";

    if (isAlphanumeric(str)) {
        std::cout << "The string contains only letters and numbers.\n";
    } else {
        std::cout << "The string contains characters other than letters and numbers.\n";
    }

    return 0;
}



/*
run:

The string contains only letters and numbers.

*/

 

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