hi [/\\][Aa][Nn][Dd] means matching \\AND or \\and or any other possible combination . This sort of syntax is used for creating customized HTTP signatures which look at the URI for matches.
[Aa][Nn][Dd] means matching AND or and or any other possible combination. This can be used for creating customised signatures that look only for matching characters or words within the inspected traffic.
In short the difference of the first regular expression from the second is if you see ascii character / or \ match. The second regular expression simply matches [Aa][Nn][Dd].
To give you a bit more detail, the  is a character class which means that with each character within the class an OR is in place. So [Bb] means match B OR b. [/\\] is the same as a hex 0x2f which is ascii / and 0x5c means \. In this case you will notice that there are two 0x5c characters. This is to escape the character since it is a meta character.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...