whell, isinCS is not case sensitive operator in mirc 6.16 becose when compare ass and assh this return true.
just type in status ->
//if (ass isincs raper cococ assh) { echo ok }
if you see the echo i have reason.
to correct than i use $matchtok with $len to locate the word i need.
i think that using ->
//if (ass $+ $chr(32) isincs raper cococ assh) { echo ok }
<- resolve problem too.