[Zope] stripping [] from a var

Hello! I have a form with a number of checkboxes (with the same name attribute). When the form is submitted I get a var in the form of: var = [checkboxvalue1, checkboxvalue2, checkboxvalue3....] I want to make a <dtml-in> loop (in a ZSQL method) using these as values. As far as I have understood, I then have to strip the [ ] from the var. How do I do this? Regards, A n d e r s G a a r s d a l H o l s t