uses StrUtils;
 
function ReversePos(SubStr, S: String): Integer;
var
  i : Integer;
begin
  i := Pos(ReverseString(SubStr), ReverseString(S));
  if i > 0 then i := Length(S) - i - Length(SubStr) + 2;
  Result := i;
end;
 
 
调用的例子:
 
  ShowMessage (IntToStr(ReversePos('abc', 'abc123abc456')));

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