How to add the space key in my PHP code?

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On my site users can register for accounts then login and such. I have restrictions on what the username they can choose has in it. My current code only allows A-Z, a-z, 0-9, _ and - but I want to add the space key.

Code: if (ereg("^[a-zA-Z0-9_]{3,16}$",$username)) {

Anyone know how to add it in?
@Ratchetr: Dashes are allowed, so the first name you suggested would work. However, for the second, my site is English only, so they would just have to type out "jyoji"
Thanks for helping tho :D
 
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