import re
regex = r"^([a-zA-Z]+ \d{1,2} \d{1,2}:\d{1,2}:\d{1,2})|([^ ]+)=([^ ]+)"

test_str = "Aug 13 17:16:33 app-srv01 kernel: newConnection - IN=eth0 OUT= MAC=56:00:01:a1:5c:b7:fe:00:01:a1:5c:b7:08:00 SRC=91.103.125.80 DST=45.33.223.166 LEN=52 TOS=0x00 PREC=0x00 TTL=113 ID=21200 DF PROTO=TCP SPT=55743 DPT=445 WINDOW=8192 RES=0x00 SYN URGP=0"

print(list(map(lambda x: tuple(filter(None, x)), re.findall(regex, test_str))))