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This is Custom Matcher to validate Credit Card
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package academy.alex;

import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeDiagnosingMatcher;

public abstract class CustomMatcher extends Util{

	public static class Type extends TypeSafeDiagnosingMatcher {
		public void describeTo(Description description) {description.appendText("Credit Card type ").appendText(" must be valid");}
		protected boolean matchesSafely(String cc_type_number, Description description) {
			
			String type = cc_type_number.split(":")[0];
			String number = cc_type_number.split(":")[1].replaceAll("\\s", "").replaceAll("-", "");
			
			if (number.startsWith("4") && (number.length() == 13 || number.length() == 16) && type.equals("VISA")) {return true;} 
			else if ((number.startsWith("51") || number.startsWith("52") || number.startsWith("53") || number.startsWith("54") || number.startsWith("55")) && number.length() == 16 && type.equals("MasterCard")) {return true;}
			else if ((number.startsWith("6011") || number.startsWith("62") || number.startsWith("64") || number.startsWith("65")) && number.length() == 16 && type.equals("Discover")) {return true;}
			else if ((number.startsWith("34") || number.startsWith("37")) && number.length() == 15 && type.equals("American Express")) {return true;}
			else {return false;}
		}
	}

	public static class Luhn extends TypeSafeDiagnosingMatcher {

		public void describeTo(Description description) {description.appendText("Credit Card  number ").appendText(" must be valid");}
		protected boolean matchesSafely(String cc_number, Description description) {
			String number = new String(cc_number.replaceAll("\\s", "").replaceAll("-", ""));
			int sum = 0; boolean swap = false;
			for (int i = number.length() - 1; i >= 0; i--) {
				int digit = Integer.parseInt(number.substring(i, i + 1));
				if (swap) {digit *= 2;if (digit > 9) {digit -= 9;}}
				sum += digit;swap = !swap;};
			description.appendValue(cc_number).appendText(" is not valid");
			return (sum % 10 == 0);
		}
	}
	public static class Expiration extends TypeSafeDiagnosingMatcher {

		public void describeTo(Description description) {description.appendText("Credit Card expiration ").appendText(" must be valid");}
		protected boolean matchesSafely(String cc_exp, Description description) {
			int exp = Integer.parseInt(cc_exp.substring(3, 5) + cc_exp.substring(0, 2)); // 02/18 => 1802
			description.appendValue(cc_exp).appendText(" is already expired");
			return today() <= exp;
		}
	}
	
	public static class CVV extends TypeSafeDiagnosingMatcher {

		public void describeTo(Description description) {description.appendText("Credit Card CVV ").appendText(" must be valid");}
		protected boolean matchesSafely(String cc_type_cvv, Description description) {
			
		String type = cc_type_cvv.split(":")[0];
		String cvv = cc_type_cvv.split(":")[1];
			
		if (type.equals("American Express")) {return cvv.matches("^(\\d{4})$");} 
		else {return cvv.matches("^(\\d{3})$");}
		}
	}
	
	public static Matcher validType() 		{return new Type();}
	public static Matcher validNumber() 	{return new Luhn();}
	public static Matcher validExpiration() {return new Expiration();}
	public static Matcher validCVV() 		{return new CVV();}
}