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If symbol of second string is equal to symbol of first string, then we will write '*' symbol, else we will write symbol of second string. So you will get all symbols, which are present in both strings.

procedure TForm1.Button1Click(Sender: TObject);
var
  MinLen, i: Integer;
  Str1, Str2: string;
begin
  Edit3.Text:='';
  if (Length(Edit1.Text)>=Length(Edit2.Text)) then
    MinLen:=Length(Edit2.Text)
  else
    MinLen:=Length(Edit1.Text);
  Str1:=Edit1.Text;
  Str2:=Edit2.Text;
  for i:=1 to MinLen do
    if Str1[i]=Str2[i] then Edit3.Text:=Edit3.Text+'*'
    else Edit3.Text:=Edit3.Text+Str2[i];
end;

Related topics

Compare string with pattern

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