code: public void replace(PushbackReader in, int bufferSize, Writer out, String format) throws IOException
      {
          InputReader reader = Input.getInstance(in, bufferSize);
          ObsoleteSimpleReplacer fsp = new ObsoleteSimpleReplacer(format);
          replace(reader, out, fsp);
      }
docs: Writes in to out replacing every match with a string
  @param in
  @param bufferSize
  @param out
  @param format
  @throws java.io.IOException
  @see String.format