It\'s a good idea but imho, there are some things that it does which should not.

1) removal of double chars (most probably because of the $addtok\'s natural behaviour)
2) even though the chars in double are not close to each other, one of them, the second one, is removed also (once more, $addtok\'s fault).
3) //echo $split.text(mirc,44,5) echoes
m,i,r
c
which imo in not what it should do because the text in input does not even contain 5 chars. When spliting at N, it should not count the Cs also.

Furthermore, the error message will never be displayed, for the simple reason that you set %k inside a condition that is out of context when an error, in this case, is to be detected.

What I would like it to do.

1) with $split.text(text,44) it should echo \"t,e,x,t\" and not \"t,e,x\"
2) with $split.text(text,44,5) it should echo \"t,e,x,t\" also and not \"t,e,x\"
\"t\"
for the same reason I gave above.

Alright for the \'review\'.

[ $mid is your friend :p ]
[ I\'ll try to scratch something like this with regexps (my passion lol) ]

Cordialement