如何正则表达式拆分时间字符串

(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})

import re

time_str = "2022-08-31 12:30:45"
pattern = r'(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})'

matches = re.match(pattern, time_str)

if matches:
    year = matches.group(1)
    month = matches.group(2)
    day = matches.group(3)
    hour = matches.group(4)
    minute = matches.group(5)
    second = matches.group(6)
    
    print("Year: ", year)
    print("Month: ", month)
    print("Day: ", day)
    print("Hour: ", hour)
    print("Minute: ", minute)
    print("Second: ", second)
else:
    print("No match found.")

Year: 2022
Month: 08
Day: 31
Hour: 12
Minute: 30
Second: 45