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	#!/usr/bin/env python3
	#
	# Copyright (C) 2018-2020 VyOS maintainers and contributors
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of the GNU General Public License version 2 or later as
	# published by the Free Software Foundation.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program. If not, see <http://www.gnu.org/licenses/>.

	import re
	import sys


	pattern = "^([0-9A-Fa-f]{2}[:]){5}([0-9A-Fa-f]{2})$"


	if __name__ == '__main__':
	if len(sys.argv) != 2:
	sys.exit(1)
	if not re.match(pattern, sys.argv[1]):
	sys.exit(1)
	sys.exit(0)