[Zope] determining if a item is a character

I wish to prevent single character searches unless they are numeric. I'm trying this in my zsql code without much luck <dtml-if "_.len(_['sequence-item'])==1"> and _.find(_.letters,_['sequence-item'])>0"> do something here... </dtml-if> ------- Regards, Graham Chiu gchiu<at>compkarori.co.nz http://www.compkarori.com/dynamo - The Homebuilt Dynamo http://www.compkarori.com/dbase - The dBase bulletin