Несколько расширенных функций по определению позиции

// Get the Position of a string, starting at the end 
// Ruckwartiges Vorkommen einer Zeichenkette innerhalb eines strings, Position von hinten 

function LastPos(SearchStr, Str: string): Integer;
var
  i: Integer;
  TempStr: string;
begin
  Result := Pos(SearchStr, Str);
  if Result = 0 then Exit;
  if (Length(Str) > 0) and (Length(SearchStr) > 0) then
  begin
    for i := Length(Str) + Length(SearchStr) - 1 downto Result do
    begin
      TempStr := Copy(Str, i, Length(Str));
      if Pos(SearchStr, TempStr) > 0 then
      begin
        Result := i;
        break;
      end;
    end;
  end;
end;

// Search for the next occurence of a string from a certain Position 
// Nachstes Vorkommen einer Zeichenkette ab einer frei definierbaren Stelle im string 

function NextPos(SearchStr, Str: string; Position: Integer): Integer;
begin
  Delete(Str, 1, Position - 1);
  Result := Pos(SearchStr, upperCase(Str));
  if Result = 0 then Exit;
  if (Length(Str) > 0) and (Length(SearchStr) > 0) then
    Result := Result + Position + 1;
end;

// Get the number of characters from a certain Position to the string to be searched 
// Anzahl der Zeichen von einer definierbaren Position zur gesuchten Zeichenkette 

function NextPosRel(SearchStr, Str: string; Position: Integer): Integer;
begin
  Delete(Str, 1, Position - 1);
  Result := Pos(SearchStr, UpperCase(Str)) - 1;
end;

// simple replacement for strings 
// einfaches Ersetzen von Zeichenketten 

function ReplaceStr(Str, SearchStr, ReplaceStr: string): string;
begin
  while Pos(SearchStr, Str) <> 0 do
  begin
    Insert(ReplaceStr, Str, Pos(SearchStr, Str));
    Delete(Str, Pos(SearchStr, Str), Length(SearchStr));
  end;
  Result := Str;
end;