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uses
  System.RegularExpressions;

const
  cAuthorRegEx = '<td width=''80'' valign=''top''>Autor:</td>[ .\r\n]{1,}<td width=''210''><span class=''angaben''>(.*?)</span></td>';
  cRequestUrl = 'http://www.buchpreis-suche.de/buchsuche.php?titel=drachengold&autor=&suche.x=0&suche.y=0';
var
  HttpLoader: TIdHttp;
  RegEx: TRegEx;
  CurrentMatch: TMatch;
begin
  HttpLoader := TIdHttp.Create;
  try
    RegEx := TRegEx.Create(cAuthorRegEx);
    CurrentMatch := RegEx.Match(HttpLoader.Get(cRequestUrl));
    while CurrentMatch.Success do
    begin
      ShowMessage(CurrentMatch.Groups[1].Value);
      CurrentMatch := CurrentMatch.NextMatch;
    end;
  finally
    HttpLoader.Free;
  end;
end;