正则表达式 A '或' B

我有以下几行：

  9 (1224) Starting item export: IPM.Appointment, Zomverbanden (wielen) monteren, 2,61 B, John \Calendar, E:\tmp\John Kn
  9 (1224) Starting item export: IPM.Appointment,  [JK], 7,97 KB, John Knappers\Calendar, E:
  9 (1224) Starting item export: IPM.Appointment, Niet op kantoor (Auto), 1,66 GB, John \Calendar, E:\tmp\John .
  9 (1224) Starting item export: IPM.Appointment, Bespip / Tobias , 9,13 KB, John \Calendar, E:\tmp\John K
  9 (1224) Starting item export: IPM.Appointment, Q-ware el / Mehan [JK], 8,01 MB, \Calendar, E:\tmp\J

如何找到这些字节和兆字节等的匹配模式？

我试过了

res = re.findall(r'(\d*,\d* KB)|(\d*,\d* MB) | (\d*,\d* B)| (\d*,\d* GB)', i)

但它返回 4 个元组的字典，但每行我只需要 1 个项目：

2,61 B
7,97 KB
1,66 GB
9,13 KB
8,01 MB