Question

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

Answer 1

import java.util.regex.Pattern;

public class Main {
    // Function to check if the string is alphanumeric
    public static boolean isAlphanumeric(String str) {
        // Define the regular expression for alphanumeric characters
        String alphanumericRegex = "^[a-zA-Z0-9]+$";

        // Use Pattern to match the string against the regular expression
        return Pattern.matches(alphanumericRegex, str);
    }

    public static void main(String[] args) {
        String str = "VuZ3q7J4wo35Pi";

        if (isAlphanumeric(str)) {
            System.out.println("The string contains only letters and numbers.");
        } else {
            System.out.println("The string contains characters other than letters and numbers.");
        }
    }
}



/*
run:

The string contains only letters and numbers.

*/

 

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