Java validate phone number using regular expression

In this tutorial, you will learn how to validate the phone number using regular expression. The user is allowed to enter a number in a specific range i.e., a number should only be in the range of 6-9 digits. It it exceeds the range or decrease the range, an error will get displayed.

Example:

import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class ValidatePhoneNumber {
  public static boolean validatePhone(String phone){
                return phone.matches("^[0-9]{6,9}$");
        }
    public static void main(String[] argv) {
 	  Scanner input = new Scanner(System.in);
	  System.out.print("Enter Phone Number: ");
                String phone = input.nextLine();
                while(validatePhone(phone) != true) {
                        System.out.print("Invalid PhoneNumber!");
                        System.out.println();
                        System.out.print("Enter Phone Number: ");
                        phone = input.nextLine();
                }
        }
}

Output:

Enter Phone Number: 9999999999
Invalid PhoneNumber!
Enter Phone Number: 999999999

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