How to search exact value in RTC query

We have attribute name product version, based on our release we add release numbers to that work item as shown below. Our problem is while searching product version it is show other version (with extension release name)  as well. How we can search exact value in query.

1.       Workitem-1 value for product version : A-1.1, B-2.1 <o:p> </o:p>

2.       Workitem-2 value for product version : A-1.1P01, B-2.2 <o:p> </o:p>

3.       Workitem-3 value for product version : C-3.1 <o:p> </o:p>

4.       Workitem-4 value for product version : A-1.1, C-3.1 <o:p> </o:p>

I’ve query to search Product Version A-1.1, <o:p> </o:p>

Results is : Workitem-1, Workitem-2, Workitem-3 workitems shows in my results but I don’t want Workitem-2, because it should not contain A-1.1 value and it contain A-1.1P01, this is different product. <o:p> </o:p>

Is there way we can query only A-1.1 worktimes. Any suggestion. <o:p> </o:p>

Thanks, <o:p> </o:p>

-Penchala <o:p> </o:p>