block flow with iptables

Question

To block packets containing some string we use the following iptables rule:

iptables -I FORWARD 1 -p tcp --dport 80 -m string --string anypattern --algo bm -j DROP

This will block the packet containing the string "anypattern".

How to block the next packets (which did not contain the "anypattern" string) but have the same ip address of the matched packet?

is it possible to make it with ip mark ?

I tried the following mark rules but it does not work

iptables -I FORWARD 1 -p tcp --dport 80 -m string --string anypattern --algo bm -j MARK --set-mark 1
iptables -I FORWARD 2 -m mark --mark 1 -j DROP

I tried the followinf command

echo anypattern | nc 192.168.1.1 80

The traffic is blocked

Later I used the same ip and port to send another message

echo othermsg | nc 192.168.1.1 80

I expected that this request will be blocked, But it's not