how to filter

Hi,
I'm Fred (Netherlands) and i have just installed version 1.9.3, i am not 
familair with modsecurity and i have this problem:

I want to filter out a string only if the ip-address is coming from the 
outsite. I mean every ip-address that not begins with 192.168.*.*

Somthing like this:

if ip-address is not 192.168.*.* then SecFilter "abc123" redirect www.google.com

Is this possible and can someone help me with this?

Greetings,
Fred Zandvliet
Netherlands

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