Replace Text in Word Document

uses ExtCtrls, ComObj

// Replace Flags
type
  TWordReplaceFlags = set of (wrfReplaceAll, wrfMatchCase, wrfMatchWildcards);
  
//

function Word_StringReplace(ADocument: TFileName; SearchString, ReplaceString: string; Flags: TWordReplaceFlags): Boolean;
const
  wdFindContinue = 1;
  wdReplaceOne = 1;
  wdReplaceAll = 2;
  wdDoNotSaveChanges = 0;
var
  WordApp: OLEVariant;
begin
  Result := False;

  { Check if file exists }
  if not FileExists(ADocument) then
  begin
    ShowMessage('Specified Document not found.');
    Exit;
  end;

  { Create the OLE Object }
  try
    WordApp := CreateOLEObject('Word.Application');
  except
    on E: Exception do
    begin
      E.Message := 'Word is not available.';
      raise;
    end;
  end;

  try
    { Hide Word }
    WordApp.Visible := False;
    { Open the document }
    WordApp.Documents.Open(ADocument);
    { Initialize parameters}
    WordApp.Selection.Find.ClearFormatting;
    WordApp.Selection.Find.Text := SearchString;
    WordApp.Selection.Find.Replacement.Text := ReplaceString;
    WordApp.Selection.Find.Forward := True;
    WordApp.Selection.Find.Wrap := wdFindContinue;
    WordApp.Selection.Find.Format := False;
    WordApp.Selection.Find.MatchCase := wrfMatchCase in Flags;
    WordApp.Selection.Find.MatchWholeWord := False;
    WordApp.Selection.Find.MatchWildcards := wrfMatchWildcards in Flags;
    WordApp.Selection.Find.MatchSoundsLike := False;
    WordApp.Selection.Find.MatchAllWordForms := False;
    { Perform the search}
    if wrfReplaceAll in Flags then
      WordApp.Selection.Find.Execute(Replace := wdReplaceAll)
    else
      WordApp.Selection.Find.Execute(Replace := wdReplaceOne);
    { Save word }
    WordApp.ActiveDocument.SaveAs(ADocument);
    { Assume that successful }
    Result := True;
    { Close the document }
    WordApp.ActiveDocument.Close(wdDoNotSaveChanges);
  finally
    { Quit Word }
    WordApp.Quit;
    WordApp := Unassigned;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Word_StringReplace('C:\Test.doc', // Datei Pfad
                     'Old String',  // Der zu ersetzende Schriftzug
                     'New String',  // Der Neue Schriftzug
                     [wrfReplaceAll]);  // Flags
end;