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

	regexFormats = {

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

		'linuxFormat' : '^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$', # linux format

		'windowsFormat' :'^([0-9a-fA-F]{2}-){5}[0-9a-fA-F]{2}$', # windows format

		'rawFormat' : '^[0-9a-fA-F]{12}$', # raw format

		'ciscoFormat' : '^([0-9a-fA-F]{4}.){2}[0-9a-fA-F]{4}$', # cisco format

	}

	regexLinuxFormat = re.compile( regexFormats['linuxFormat'] )

	regexWindowsFormat = re.compile( regexFormats['windowsFormat'] )

	regexRawFormat = re.compile( regexFormats['rawFormat'] )

	regexCiscoFormat = re.compile( regexFormats['ciscoFormat'] )

	error_message = _( 'That is not a valid MAC address.' )

		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:

			temp = []

			for i in range(0, len(text.translate(None, '.'))-1, 2):

				temp.append(text.translate(None, '.')[i:i+2])

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

		else:

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