Validate American Phone Number with Regular Expression in Java

Run Application

Create new java file named Main.java. This file use Regular Expression check validate American Phone Number as below:

package regular_expression;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {

	private static boolean isValid(String phone) {
		String americanPhoneNumberPattern = "^\\(?([0-9]{3})\\)?[-.\\s]?([0-9]{3})[-.\\s]?([0-9]{4})$";
		Pattern pattern = Pattern.compile(americanPhoneNumberPattern, Pattern.CASE_INSENSITIVE);
		Matcher matcher = pattern.matcher(phone);
		return matcher.matches();
	}

	public static void main(String[] args) {

		String phone1 = "12-12-111";
		boolean result1 = isValid(phone1);
		System.out.println("Result 1: " + result1);

		String phone2 = "123-456-7890";
		boolean result2 = isValid(phone2);
		System.out.println("Result 2: " + result2);

	}

}

Output

Result 1: false
Result 2: true