Allow only certain characters

Posted by Gandalf StormCrow on Stack Overflow See other posts from Stack Overflow or by Gandalf StormCrow
Published on 2010-05-07T17:28:03Z Indexed on 2010/05/07 17:38 UTC
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I'd like to block all characters from being inputed except 0-9,a-z,A-Z range only alphanumeric characters. So when someone types ! for examplee nothing is written into input. How can I do that?

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