You can try using this variant of the script:
Code
on *:TEXT:*words*:#chan:{ .ban -k $chan $nick 3 | .mode $chan +b $+(*!*,$remove($gettok($address($nick,0),1,64),*,!),*@*) }

Step-by-step explanation of the sequence of actions:

     1. $address($nick,0) - this returns the mask of the address of the user who is on the channel. More details: Here
     2. $gettok($address($nick,0),1,64) - this returns 1 mask token, separated by "@". More details: Here
     3. $remove($gettok($address($nick,0),1,64),*,!) - this will cut out all the extra characters. More details: Here
     4. $+(*!*,$remove($gettok($address($nick,0),1,64),*,!),*@*) - this adds any required wildcards to the identifier. More details: Here


The correct syntax for the user address mask is: "nick!ident@host"


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