procedure TForm1.Button2Click(Sender: TObject);
var
WantedWord, s, w: String;
i, j, n: Integer;
begin
WantedWord:='style="background:#331111"';
n:=0;
for i:=0 to Memo1.Lines.Count-1 do
begin
s:=Memo1.Lines[i]+' ';
j:=1;
while j<=Length(s) do
begin
w:='';
while s[j]<>' ' do
begin
w:=w+s[j];
j:=j+1;
end;
if w=WantedWord then n:=n+1;
j:=j+1;
end;
end;
if n>0 then ShowMessage('Количество слов: '+IntToStr(n));
end;