code: public static String extractValue(String input) {
          int index = input.indexOf('=') + 1;
          if (0 == index || index >= input.length()) {
              return "";
          }
          return input.substring(index).trim();
      }
docs: Extract the value of a key=value pair contained within the
  provided string. If no value exists, then an empty string
  is returned.
  
  @param input
  @return String