text box alphanumeric caracters only

Posted on 16th Feb 2014 07:03 pm by admin

hi all!

I have search on google on how to enter in a test box only caracters A-Z,a-z,0-9 using php, but all the solutions are not for me
I need, if you can help me to allow a user to insert only those caracters and with no space at all, like in username field.

Can you please help me with an example?

Thanks!

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