逗号分开的字符串，统计个数从高到底排序

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  System.RegularExpressions,

function CompareStrings(List: TStringList; Index1, Index2: Integer): Integer;
begin
  Result := StrToInt(List.ValueFromIndex[Index2]) - StrToInt(List.ValueFromIndex[Index1]);
end;

procedure TForm1.Button1Click(Sender: TObject);
   var
  InputString: string;
  SubString: string;
  Matches: TMatchCollection;
  Match: TMatch;
  SubStringCounts: TStringList;
begin
   Memo1.Clear;


  InputString := 'www,eee,rrr,rrr,rrr,eee,r';
  SubStringCounts := TStringList.Create;

  // 使用正则表达式匹配字符串    System.RegularExpressions,
  Matches := TRegEx.Matches(InputString, '\w+');

  // 统计各个子字符串出现的次数
  for Match in Matches do
  begin
    SubString := Match.Value;
    if SubStringCounts.IndexOfName(SubString) = -1 then
      SubStringCounts.Add(SubString + '=1')
    else
      SubStringCounts.Values[SubString] := IntToStr(StrToInt(SubStringCounts.Values[SubString]) + 1);
  end;

  // 输出结果
  for SubString in SubStringCounts do
  begin
  Memo1.Lines.Add(SubString)

  end;

  SubStringCounts.Free;


end;

procedure TForm1.Button2Click(Sender: TObject);
var
  InputString: string;
  SubString: string;
  Matches: TMatchCollection;
  Match: TMatch;
  SubStringCounts: TStringList;
begin
  Memo1.Clear;
  InputString := 'www,eee,rrr,rrr,rrr,eee';
  SubStringCounts := TStringList.Create;

  // 使用正则表达式匹配字符串
  Matches := TRegEx.Matches(InputString, '\w+');

  // 统计各个子字符串出现的次数
  for Match in Matches do
  begin
    SubString := Match.Value;
    if SubStringCounts.IndexOfName(SubString) = -1 then
      SubStringCounts.Add(SubString + '=1')
    else
      SubStringCounts.Values[SubString] := IntToStr(StrToInt(SubStringCounts.Values[SubString]) + 1);
  end;

  // 对统计结果进行排序，出现次数最多的放在最前面

  SubStringCounts.CustomSort(CompareStrings);

  // 输出排序后的结果
  for SubString in SubStringCounts do
  begin
   Memo1.Lines.Add(SubString)
  end;

  SubStringCounts.Free;

end;