:INPUT,FORWARD,OUTPUT
-m length --length 1;=;OK
-m length --length :2;-m length --length 0:2;OK
-m length --length 0:3;=;OK
-m length --length 4:;-m length --length 4:65535;OK
-m length --length :;-m length --length 0:65535;OK
-m length --length 0:65535;=;OK
-m length ! --length 0:65535;=;OK
-m length --length 0:65536;;FAIL
-m length --length -1:65535;;FAIL
-m length --length 4:4;-m length --length 4;OK
-m length --length 4:3;;FAIL
-m length;;FAIL
