any NOT RLIKE kind of function for Impala filter in cloudera manager?

[#1]

this is for searching Impala queries thru cloudera manager UI. 

I use following filter to find all the queries running with user ids starting with zs:

user RLIKE '.*zs.*'

I needed to write another filter which is more like NOT RLIKE  to find those queries for which user does not start with zk.  I tried stuff like below but did not work

user NOT RLIKE '.*zk.*'

user  RLIKE !'.*zk.*'

Search documentation already and did not find any thing like this.