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patterns = [pattern]		patterns = [pattern]

targets = []		targets = []
for pattern in patterns:		for pattern in patterns:
# remove any leading '!'		# remove any leading '!'
test_pattern = pattern.lstrip('!')		test_pattern = pattern.lstrip('!')

# change '.' to literal period		# change '.' to literal period
test_pattern = test_pattern.replace('.', '\.')		test_pattern = test_pattern.replace('.', r'\.')

# convert '*' to match a-Z, 0-9, _, -, or .		# convert '*' to match a-Z, 0-9, _, -, or .
test_pattern = test_pattern.replace('', '[\w\.-]')		test_pattern = test_pattern.replace('', r'[\w\.-]')

# Add beginning and end marks		# Add beginning and end marks
test_pattern = '^{}$'.format(test_pattern)		test_pattern = '^{}$'.format(test_pattern)

regex = re.compile(test_pattern)		regex = re.compile(test_pattern)

targets.extend([host for host in hosts if regex.match(host)])		targets.extend([host for host in hosts if regex.match(host)])

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