import re
s = '2021/12/23 13:00 14:00 2021/12/24 13:00 14:00 15:00'
for i in re.findall(r'\d+/\d+/\d+(?:\s\d+\:\d+)+', s): print (i.split())
aW1wb3J0IHJlCgpzID0gJzIwMjEvMTIvMjMgMTM6MDAgMTQ6MDAgMjAyMS8xMi8yNCAxMzowMCAxNDowMCAxNTowMCcKCmZvciBpIGluIHJlLmZpbmRhbGwocidcZCsvXGQrL1xkKyg/OlxzXGQrXDpcZCspKycsIHMpOiBwcmludCAoaS5zcGxpdCgpKQ==