There's an IS_ALPHANUMERIC validator for that: 
http://web2py.com/book/default/chapter/07#Validators

On Thursday, April 14, 2011 1:43:40 AM UTC-4, cyber wrote:

> I would like to exclude some chars when my form validates. 
> I need to insert/update record value only with letters and digits. 
> The undesirable chars are: [-](_)*/&%!@#$^ etc 
>
> How can I validate form?

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