從字符串中提取單詞、從字符串中提取漢字的函數

//單元 
{從字符串中提取單詞的函數}
SysUtils.CharInSet();

procedure StrToWordList(str: string; var List: TStringList);
var
  p: PChar;
  i: Integer;
begin
  if List = nil then List := TStringList.Create;
  List.Clear;
  {去除重復}
  List.Sorted := True;
  List.Duplicates := dupIgnore;
  
  p := PChar(str);

  {把單詞以外的字符轉為空格, 並把大寫字母轉小寫}
  while p^ <> #0 do
  begin
    case p^ of
      'A'..'Z': p^ := Chr(Ord(p^) + 32);
      'a'..'z', '0'..'9', '''', '-': ;
      else p^ := #32;
    end;
    Inc(p);
  end;

  {用空格分離單詞到列表}
  List.Delimiter := #32;
  List.DelimitedText := str;

  {單詞的開頭應該是字母, 去除其他}
  for i := List.Count - 1 downto 0 do
  begin
    if CharInSet(List[i][1], ['0'..'9', '-', '''']) then
    List.Delete(i);
  end;
end;

{從字符串中提取漢字的函數}
procedure StrToHanZiList(str: string; var List: TStringList);
var
  p: PWideChar;
begin
  if List = nil then List := TStringList.Create;
  List.Clear;
  {去除重復}
  List.Sorted := True;
  List.Duplicates := dupIgnore;
  
  p := PWideChar(str);
  while p^ <> #0 do
  begin
    case p^ of
      #$4E00..#$9FA5: List.Add(p^);
    end;
    Inc(p);
  end;
end;