[Zope] String manipulation

Hello, I am looking for some functions to manipulate som strings (these are dtml-var's). E.g. I have a comma-separeted string I need to convert to an array (and back again). Any good how-to's Regards, -- ************************ Gitte Wange Jensen System Squid Developer MMManager Aps +45 29 72 79 72 gitte@mmmanager.org ************************