goja-core/src/main/java/goja/core/Validator.java
public static boolean isZipCode(String value) {
        String check = "^[0-9]{6}$";
        return match(check, Pattern.CASE_INSENSITIVE, value);
    }
public static boolean isZipCode(String value) {
        String check = "^[0-9]{6}$";
        return match(check, Pattern.CASE_INSENSITIVE, value);
    }
Postal Code

@param value value
@return boolean