Get Between Tag of HTML ~ Delphi

Holooo.. cold weather make me stay on my dekstop, in my village was rain guest.. today i am trying to read the HTML of a website using the Delphi WebBrowser component. like between Target or like and this is code to find it.

uses 
StrUtils, mshtml;

procedure TForm1.Button1Click(Sender: TObject);
  function GetBetweenTags(TagStart, TagStop, HtmlText: String): string;
  Var
    P, P2: Integer;
    str: String;
  begin
    result := '';
    P := Pos(TagStart, HtmlText);
    if P>0 Then
    begin
      P2 := PosEx(TagStop, HtmlText, P);
      if P2>0 Then
        result := copy(HtmlText, P+length(TagStart), P2-(P+length(TagStart)));
    end;
  end;

var
  iall: IHTMLElement;
begin
  if Assigned(WebBrowser1.Document) then
  begin
    iall := (WebBrowser1.Document AS IHTMLDocument2).body;
    while iall.parentElement <> nil do
    begin
      iall := iall.parentElement;
    end;
    showmessage(GetBetweenTags('', uppercase(iall.outerHTML))); //we use uppercase to be sure to find the tags
  end;
end;