Trying to get the Syntax right.

So I am trying to get an iRule that allows only servers I approve of on the VIP. So I created a class named allowed_servers and if the IP doesn't match that list I want the VIP to drop the connection.

So this is what I came up with but the iRule editor always tells me that "line 2: [parse error: PARSE missingBracket 28 {missing close-bracket}] [{[class matches [string[IP::client_addr] not equals allowed_servers]}]"

I can't find where I am supposed to put that close-bracket, can anyone help?

when CLIENT_ACCEPTED {

if {[class matches [string[IP::client_addr] not equals allowed_servers]}

{drop}

}

Thanks,

Ken