...change the Background Color in TRichEdit for the selected characters?

uses
  RichEdit;

procedure RE_SetSelBgColor(RichEdit: TRichEdit; AColor: TColor);
var
  Format: CHARFORMAT2;
begin
  FillChar(Format, SizeOf(Format), 0);
  with Format do
  begin
    cbSize := SizeOf(Format);
    dwMask := CFM_BACKCOLOR;
    crBackColor := AColor;
    Richedit.Perform(EM_SETCHARFORMAT, SCF_SELECTION, Longint(@Format));
  end;
end;

// Example: Set clYellow background color for the selected text.
procedure TForm1.Button1Click(Sender: TObject);
begin
  RE_SetSelBgColor(RichEdit1, clYellow);
end;

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