Validate Credit Card Number with Regular Expression in Java

Run Application

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

package regular_expression;

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

public class Main {

	private static boolean isValid(String creditCardNumber) {
		String creditCardNumberPattern = "((?:(?:\\d{4}[- ]){3}\\d{4}|\\d{16}))(?![\\d])";
		Pattern pattern = Pattern.compile(creditCardNumberPattern, Pattern.CASE_INSENSITIVE);
		Matcher matcher = pattern.matcher(creditCardNumber);
		return matcher.matches();
	}

	public static void main(String[] args) {

		String creditCardNumber1 = "44444444444abc";
		boolean result1 = isValid(creditCardNumber1);
		System.out.println("Result 1: " + result1);

		String creditCardNumber2 = "4444444444444448";
		boolean result2 = isValid(creditCardNumber2);
		System.out.println("Result 2: " + result2);

	}

}

Output

Result 1: false
Result 2: true