Cisco TelePresence Administrator's Manual page 361

[...] Matches a set
of specified
characters.
Each
character in
the set can be
specified
individually,
or a range
can be
specified by
giving the first
character in
the range
followed by
the -
character and
then the last
character in
the range.
You cannot
use special
characters
within the [] -
they will be
taken literally.
[^...] Matches
anything
except the set
of specified
characters.
Each
character in
the set can be
specified
individually,
or a range
can be
specified by
giving the first
character in
the range
followed by
the -
character and
then the last
character in
the range.
You cannot
use special
characters
within the [] -
they will be
taken literally.
Cisco VCS Administrator Guide (X7.1)
[a-z] matches any alphabetical character
[0-9#*] matches against any single E.164 character - the E.164 character set is made
up of the digits 0-9 plus the hash key (#) and the asterisk key (*)
[^a-z] matches any non-alphabetical character
[^0-9#*] matches anything other than the digits 0-9, the hash key (#) and the asterisk
key (*)
Reference material
Page 361 of 479