I want to ban nick fields with a word. (bad english sorry)
examples:
assase
besase
acsase
ocsase

i want autoban script for this word "sase"

on *:text:*sase*:#ChannelName:{ ban -k $chan $nick 5 }

You can see more features of ban with /help /ban

Be careful about using wildcards, which can cause kickbanning everyone in the same city.

If you want to ban nicknames containing 'sase', just use the command /mode #chan +b *sase*!*@*