time difference bettwenn logs

[rob101]

Personally, I would not use regex in situations where the position of the data is known and unchanging; rather, I'd simply use the index positions.

As a simple demonstration:

with open("log", mode="r", encoding="UTF-8") as log:
    for entry, item in enumerate(log, 1):
        time_stamp = item[12:20]
        print(f"{entry:02d}:~", time_stamp)

To add: as working demonstration of the difference between the time entries:

from datetime import datetime

time_stack = []

with open("log", mode="r", encoding="UTF-8") as log:
    for entry, item in enumerate(log, 1):
        time_str = item[12:20]
        time_stamp = datetime.strptime(time_str, '%H:%M:%S')
        time_stack.append(time_stamp)
        if len(time_stack) > 1:
            print(f"{entry:02d}:~", time_str, (time_stack[1] - time_stack[0]))
            time_stack.pop(0)
        else:
            print(f"{entry:02d}:~ Start", time_str)

Output:
01:~ Start 07:38:33
02:~ 07:38:33 0:00:00
03:~ 07:38:33 0:00:00
04:~ 07:38:33 0:00:00
05:~ 07:38:33 0:00:00
06:~ 07:38:33 0:00:00
07:~ 07:38:33 0:00:00
08:~ 07:38:33 0:00:00
09:~ 07:38:33 0:00:00
10:~ 07:38:33 0:00:00
11:~ 07:38:33 0:00:00
12:~ 07:38:33 0:00:00
13:~ 07:38:34 0:00:01
14:~ 07:38:34 0:00:00
15:~ 07:38:35 0:00:01
16:~ 07:38:37 0:00:02