Program to check valid mobile number using Java regular expressions

You can match a valid mobile number using the following regular expression −

"\d{10}"

• A valid mobile number generally have 10 digits (in India).
• The metacharacter "\d" matches the digits from 0 to 9.
• The quantifier ex{n} suggests the repetition of ex n times.

Example 1

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PhoneNumberExample {
   public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter your name: ");
      String name = sc.nextLine();
      System.out.println("Enter your Phone number: ");
      String phone = sc.next();
      //Regular expression to accept valid phone number
      String regex = "\d{10}";
      //Creating a pattern object
      Pattern pattern = Pattern.compile(regex);
      //Creating a Matcher object
      Matcher matcher = pattern.matcher(phone);
      //Verifying whether given phone number is valid
      if(matcher.matches()) {
         System.out.println("Given phone number is valid");
      } else { 
         System.out.println("Given phone number is not valid");
      }
   }
}

Output 1

Enter your name:
krishna
Enter your Phone number:
9848022338
Given phone number is valid

Output 2

Enter your name:
krishna
Enter your Phone number:
5465
Given phone number is not valid

Output 3

Enter your name:
krishna
Enter your Phone number:
984802354655
Given phone number is not valid

Example 2

import java.util.Scanner;
public class Test {
   public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter your Phone number: ");
      String phone = sc.next();
      //Regular expression to accept valid phone number
      String regex = "\d{10}";
      //Matching the given phone number with regular expression
      boolean result = phone.matches(regex);
      if(result) {
         System.out.println("Given phone number is valid");
      } else {
         System.out.println("Given phone number is not valid");
      }
   }
}

Output 1

Enter your Phone number:
9848022338
Given phone number is valid

Output 2

Enter your Phone number:
123
Given phone number is not valid

Output 3

Enter your Phone number:
123654788755
Given phone number is not valid