[Zope] How to check if a string contains some characters??

[Marcello Lupo]

Sorry to bother you,
Is there a simple way to check if a string contain only this values:
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.-_"
and otherwise raise an error?
Thank you in advice,
Marcello

     
-- 
----------------------------------------
Marcello Lupo            Project Manager
               Atis Srl
          Via dell'Artigliere 2
      37014 Castelnuovo del Garda (VR)
Tel. +39-0457570960 - Fax +39-0457571268
       E-mail: lupo@atisworld.com
        http://www.atisworld.com
-----------------------------------------