Please see the examples below.
Case sensitive to exclude everything with brisbane and include everything with rtr:
^((?!.*brisbane.*).*rtr.*)*$
Case insensitive to exclude everything with brisbane and include everything with rtr:
^((?i)(?!.*brisbane.*).*rtr.*)*$
Below is an example of using this regex to create a group of all devices with rtr in their sysName except Brisbane:
