import re
 
regex = r"\b(?:\d{6} \d{5}|[1-9]\d{4} \d{5}|[1-9]\d{9}|\d{11})\b"
 
test_str = ("Pattern 1 - The length of this pattern is exactly 10 and cannot start with a zero. These consist of only integers. Ex: '1234567890'\n\n"
	"Pattern 2 - The length of this pattern is exactly 11 and can start with a zero. These consist of only integers. Ex: '01234567890'\n\n"
	"Pattern 3 - The length of this pattern is exactly 11 and cannot start with a zero. There is one space after the 5th number and all other characters are numbers. Ex: '12345 67890'\n\n"
	"Pattern 4 - The length of this pattern is exactly 12 and can start with a zero. There is one space after the 6th number and all other characters are numbers. Ex: '012345 67890'\n\n"
	"Test 0000000000\n"
	"Test 123456789011\n"
	"Test 02345 66666")
 
print(re.findall(regex, test_str))

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