Username with ascii characters

Hello, i'm having and html form and i would like the user in
the username field to type ONLY ascii characters.
For example, in other fields of the form i
would like the user to type his mother language but
as far as the username and password fields are concerned
the characters have to be ascii.
How am i supposed to check when the username is accepted/correct (*consists of ascii characters*)?
and which are the desirable characters a username must have (e.g. *?* is a desirable character in a username , *:* this one?)
Thanks, in advance!

g_p_java wrote:
How am i supposed to check when the username is accepted/correct (*consists of ascii characters*)?ASCII characters are the Unicode characters whose code points are between 0 and 127.
and which are the desirable characters a username must have (e.g. *?* is a desirable character in a username , *:* this one?)I don't understand this. You have already said they must be ASCII. You have other requirements? Fine, go ahead and program them and ask questions if you have problems with that. Personally I don't think that requiring somebody to have a question mark in their user name is a good idea -- but probably you didn't mean it when you suggested that.

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    http://foundationphp.com/

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