Use standard properties of the RichEdit component.
SelStart is a new position of the caret.
SelLength is the number of characters that are selected. This parameter should be 0, if we want to work with caret only.
procedure TForm1.Button1Click(Sender: TObject); begin with RichEdit1 do begin SetFocus; SelStart:=30; SelLength:=0; end; end;
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