[cleaner] Improve IPV6 MAC address RE

Current RE obfuscates also UUID strings, let be more strict.

Resolves: sosreport#3767
Relevant: sosreport#3736

Signed-off-by: Pavel Moravec <pmoravec@redhat.com>

sos/cleaner/parsers/mac_parser.py

@@ -20,9 +20,9 @@
     r'[0-9a-fA-F]{2}(\'|\")?(\/|\,|\-|\.|\s|$))'
 )
 # aabb:ccee:ddee:ffaa
-IPV6_REG_4HEX = (
-    r'((?<!([0-9a-fA-F\'\"]:)|::)(([^:\-]?[0-9a-fA-F]{4}(:|-)){3}'
-    r'[0-9a-fA-F]{4}(\'|\")?(\/|\,|\-|\.|\s|$)))'
+IPV6_REG_4HEX_NEW = (
+        r'((?<!\w)(([0-9a-fA-F]{4}:){3}[0-9a-fA-F]{4})(?!\w))|'
+        r'((?<!\w)(([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{4})(?!\w))'
 )
 # aa:bb:cc:dd:ee:ff avoiding ipv6 substring matches
 IPV4_REG = (