[Zope] How do I get a catalog to index numbers correctly?

[Rob Foster]

I've got around 1000 items in my ZODB that have been indexed by several 
fields - keyword, description, etc.

I've got a search page that allows searches on these fields, but when 
search for items using numerical keywords, I get no results.

Example: I've got "Object123" with these keywords:
object
object123
123

Object123 comes up when I search "object" or "object123" but not when I 
search for "123" by itself.

I can see the numerical keywords in the dictionary too.

Please help.
Thanks,
Rob