Hi,
You are going to need to write custom code to accomplish what you need.
Here is a Knowledge Base article that will get you started:
826992: How To: Use Wildcard Characters in an InfoPath Form Query When Bind
http://support.microsoft.com/default.aspx?scid=kb;EN-US;826992
I hope this helps!
Best Regards,
Scott L. Heim
Microsoft Developer Support
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