Lukey, it's not intended to be unhelpful or patronising, but there is already a useful Search facility on this site - if you type "computer code for alphanumeric characters" in the red search box at the top of the screen, you can see how often this question has been asked (and answered) already in the last few days.
I think that those of us who do not use the site very often and are not fully aware of the search facility in the red box do not need smart arse answers from others who must have so much time to waste and think them selves so very clever!!!!!!!!!!!!!!!!
Don't get ruffled, folks - it's not worth it, and I don't think the first reply was patronisin just factual, but it would have been helpful to have indicated how the OP could check for themselves.