When using the ON TEXT prefix, there is a problem when using Hebrew nicks.
If you want to trigger a text, lets say !hi without any color, you just need to do:
ON *:TEXT:!hi:#:msg # hi
But for that prefix to work with Hebrew nicks, you will have to change it to:
ON *:TEXT:*!hi:#:msg # hi

Why does that happens? And could it be fixed?

Works fine here. Maybe the guy with the hebrew nick is writing in color?

No.
I've tested it by changing nickname, and then writing and pressing Ctrl + Enter.
The same process works find when i'm on an English nickname, but not on the hebrew one.

It looks like it thinks that because the nick is in Hebrew that he's writing something else before the text.

Interesting. Try this script:

• On *:text:*:#:echo -s $nick said: $1-

Now when the hebrew nick speaks, does $1- contain something else except the actual text?

Sorry about that, i've talked to the Admin of the network that I am in, it's something inside the server's configuration.
It's for the nick will not look inverted.