APM IP subnet expression failing to match

Trying to match client ip to IP subnets but can't seem to get the syntax right. I've tried the following expressions below, and a few others, but I keep getting a syntax error. Any help would be appreciated. Thanks.

expr { [IP::addr [mcget {session.user.clientip}] equals "10.10.10.0/24 or 172.16.0.0/27"] }

expr { [IP::addr [mcget {session.user.clientip}] equals "10.10.10.0/24"] or [IP::addr [mcget {session.user.clientip}] equals "172.16.0.0/27"] }