For developing any software application we need to validate the inputs entered by the user. It is a common task for developers in any programming language.

In java, we have regular expression, in which we can validate a different set of inputs like phone, Name, DOB, Credit Cards, etc.

Table of Content :

Validating a phone number using regular expression is tricky because the phone number can be written in many formats and can also contain extensions.


        String Afghanistan      = "+93 30 539-0605";
        String Australia        = "+61 2 1255-3456";

        String China            = "+86 (20) 1255-3456";

        String Germany          = "+49 351 125-3456";

        String India            = "+91 9876543210"; 

        String Indonesia        = "+62 21 6539-0605";

        String Iran             = "+98 (515) 539-0605";

        String Italy            = "+39 06 5398-0605";

        String NewZealand       = "+64 3 539-0605";

        String Philippines      = "+63 35 539-0605";

        String Singapore        = "+65 6396 0605";

        String Thailand         = "+66 2 123 4567";

        String UK               = "+44 141 222-3344";

        String USA              = "+1 (212) 555-3456";

        String Vietnam          = "+84 35 539-0605";

International phone number regex - Example 1

For the phone number validation we need to take 3 or 4 different patterns and combine them with "|": 


String phoneRegex =  "\\d{10}|(?:\\d{3}-){2}\\d{4}|\\(\\d{3}\\)\\d{3}-?\\d{4}";

  • \d{10} matches 1234567890
  • (?:\d{3}-){2}\d{4} matches 123-456-7890
  • \(\d{3}\)\d{3}-?\d{4} matches (123)456-7890 or (123)4567890 

 import java.util.regex. * ;

public class PhoneNumberValidator {

	private static String phoneRegex = "\\d{10}|(?:\\d{3}-){2}\\d{4}|\\(\\d{3}\\)\\d{3}-?\\d{4}";
	private static String phoneNo = "1234567890";
	public static void main(String[] args) {

		if (phoneNo.matches(phoneRegex)) {

			System.out.println("Phone number 1234567890 is valid.");
		}
		else {
			System.out.println("Phone number 1234567890 is Invalid.");
		}

	}

} 

output:
Phone number 1234567890 is valid.

International phone number regex - Example 2


import java.util.regex. * ;

public class PhoneNumberValidator2 {

	private static String phoneRegex = "\\d{10}|\\d{3}[-\\.\\s]\\d{3}[-\\.\\s]\\d{4}|\\d{3}-\\d{3}-\\d{4}\\s(x|(ext))\\d{3,5}|\\(\\d{3}\\)-\\d{3}-\\d{4}";

	public static void main(String[] args) {
		System.out.println("Phone number 1234567890 is valid : " + validatePhone("12345678902"));
		System.out.println("Phone number 123-456-7890 is valid : " + validatePhone("123-456-7890"));
		System.out.println("Phone number 123-456-7890 x1234 is valid : " + validatePhone("123-456-7890 x1234"));
		System.out.println("Phone number 123-456-7890 ext1234 is valid : " + validatePhone("123-456-7890 ext1234"));
		System.out.println("Phone number (123)-456-7890 is valid : " + validatePhone("(123)-456-7890"));
		System.out.println("Phone number 123.456.7890 is valid : " + validatePhone("123.456.7890"));
		System.out.println("Phone number 123 456 7890 is valid : " + validatePhone("123 456 7890"));

		System.out.println("Phone number 123 456 78904 is valid : " + validatePhone("123 456 78904"));

	}

	private static boolean validatePhone(String phoneNo) {

		if (phoneNo.matches(phoneRegex)) {
			return true;
		}
		else {
			return false;
		}

	}

}

output:
Phone number 1234567890 is valid : false
Phone number 123-456-7890 is valid : true
Phone number 123-456-7890 x1234 is valid : true
Phone number 123-456-7890 ext1234 is valid : true
Phone number (123)-456-7890 is valid : true
Phone number 123.456.7890 is valid : true
Phone number 123 456 7890 is valid : true
Phone number 123 456 78904 is valid : false

International phone number regex - Example 3 


import java.util.regex. * ;

public class PhoneNumberValidator3 {

	private static String phoneRegex = "^\\s?((\\+[1-9]{1,4}[ \\-]*)|(\\([0-9]{2,3}\\)[ \\-]*)|([0-9]{2,4})[ \\-]*)*?[0-9]{3,4}?[ \\-]*[0-9]{3,4}?\\s?";
	private static String phoneNo = " +33 - 123 456 789 ";
	public static void main(String[] args) {

		if (Pattern.compile(phoneRegex).matcher(phoneNo).matches()) {
			System.out.println(phoneNo + " is a valid phone number.");
		} else {
			System.out.println(phoneNo + " is a Invalid phone number.");
		}
	}

}

output:
 +33 - 123 456 789  is a valid phone number.

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In this article, we have seen how to  Validate international phone numbers in Java using regex with examples. All source code in the article can be found in the GitHub repository.