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