regex = re.compile( '^([0-9a-fA-F]{1,2}[:-]){5}[0-9a-fA-F]{1,2}$' )

	regexLinuxFormat = re.compile( r'^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$' )

	error_message = _( 'This is not a valid MAC address. It must have 6 two digit hexadecimal numbers separated by \"-\" or \":\"' )

	regexWindowsFormat = re.compile( r'^([0-9a-fA-F]{2}-){5}[0-9a-fA-F]{2}$' )

	regexRawFormat = re.compile( r'^[0-9a-fA-F]{12}$' )

	regexCiscoFormat = re.compile( r'^([0-9a-fA-F]{4}.){2}[0-9a-fA-F]{4}$' )

	error_message = _( 'This is not a valid MAC address (valid examples are 86:f5:d1:f5:6b:3e, 23-b6-b8-1b-b0-1b, 04b02c7bdb87, 3ac6.8dcd.b12e)' )

		simple.parse( text )

		if self.regexLinuxFormat.match(text) is not None:

		return text.replace( '-', ':' ).lower()

			return  text.lower()

		elif self.regexWindowsFormat.match(text) is not None:

			return  text.replace('-', ':').lower()

		elif self.regexRawFormat.match(text) is not None:

			temp = []

			for i in range(0, len(text)-1, 2):

				temp.append(text[i:i+2])

			return ':'.join(temp).lower()

		elif self.regexCiscoFormat.match(text) is not None:

			tmpList = []

			tmpStr = text.translate(None, '.'))-1, 2):

			for i in range(0, len(tmpStr)-1, 2):

				tmpList.append(tmpStr)[i:i+2])

			return ':'.join(tmpList).lower()

		else:

			raise univention.admin.uexceptions.valueError( self.error_message )