Search and replace text in a RichEdit

Author: Thomas Stutz

function Search_And_Replace(RichEdit: TRichEdit;

SearchText, ReplaceText: string): Boolean;

var

startpos, Position, endpos: integer;

begin

startpos := 0;

with RichEdit do

begin

endpos := Length(RichEdit.Text);

Lines.BeginUpdate;

while FindText(SearchText, startpos, endpos, [stMatchCase])<>-1 do

begin

endpos := Length(RichEdit.Text) - startpos;

Position := FindText(SearchText, startpos, endpos, [stMatchCase]);

Inc(startpos, Length(SearchText));

SetFocus;

SelStart := Position;

SelLength := Length(SearchText);

richedit.clearselection;

SelText := ReplaceText;

end;

Lines.EndUpdate;

end;

end;

procedure TForm1.Button1Click(Sender: TObject);

begin

Search_And_Replace(Richedit1, 'OldText', 'NewText');

end;