[Zope] Problem : ZCatalog

Hello, I've got a problem with a search form. I have a ZCatalog with lots of entries. I added the index "absolute_url" in order to search by the files url. Why ? 'cause I have files in organized folders like that : ......../language_name/country_name/city_name/element I'd like to do a search on "#language_name and #country_name and #city_name" in my catalog, so I use the absolute_url. But the problem is that the search only looks the end of the absolute_url string, that's to say "element" in my exemple. How could I search in all the string ? Sorry for my bad english. Fabien.