When signing up for a new username, are upper and lower case letters an option, and can I use the &

[mr.el-camino]

When signing up for a new username, are upper and lower case letters an option, and can I use the & symbol ?

[nubian_treasures]

Here's the username policy:

http://pages.ebay.ca/help/account/user-id.html

[karl*katz]

Try the user ID of your choice.

Either it will work or it wont