public static boolean isEmailValid(String value) throws Exception{
        // Trim the email id before checking whether it is valid or not.
        if(value != null && value.equals("")){
             return true;
        }else{
            String pattern= "^[a-zA-Z0-9.+_-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,4}$"; // No I18N
            if(value.matches(pattern)){
                   return true;
            }else{
                  return false;
            }
        }
    }