Selecting random number excluding one

I want to do something like

exclude = 2;

variable = floor(random(4));

variable != exlude

If not repeat until variable != exlcude.

Is there an easy way to do this or do I have to code it myself?

I can't use choose because the random number may be very large

Thanks

How about

choose(floor(random(2)), floor(random(3,4)))