import re
regex = r"(?:(?!\\n\\n\\n).)+\\n(?=\\n\\n)"
test_str = ("Game #16406772158 starts.\\n#Game No : 16406772158\\n\n"
	"Yl9Ui1OhAPyGV0JlCPLRrg wins $0.75 USD\\nG72AzGPQLTOWfYoNST1K/g wins $10 USD\\n'4bSQFjpEWTIcsil7GJkkVA wins $39.99 USD from the main pot with three of a kind, Kings.\\n'U3xFxCVFfFBt50sL9VgLgQ wins $1.45 USD\\nwins $0.75 USD\\n\\n\\nGame #16406772158 starts.\\n#Game No : 16406772158\\n....\n"
	"wins $0.75 USD\\n\\n\\n\n"
	"Game #16406772158 starts.\\n#Game No : 16406772158\\n\n"
	"....\n"
	"wins $0.75 USD\\n\\n\\n")
result = []
matches = re.finditer(regex, test_str, re.DOTALL)
for match in matches:
    #print ("Match was found at {start}-{end}: {match}".format(start = match.start(), end = match.end(), match = match.group()))
    result.append(match.group())
print(result)

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