code: public static boolean isNextAlphaNum(final Buffer buffer) throws IndexOutOfBoundsException, IOException {
          if (buffer.hasReadableBytes()) {
              final byte b = buffer.peekByte();
              return isAlphaNum(b);
          }
  
          return false;
      }
docs: Check whether next byte is a alpha numeric one.
  
  @param buffer
  @return true if the next byte is a alpha numeric character, otherwise
  false
  @throws IOException
  @throws IndexOutOfBoundsException