OPS - create custom report by part of policy name

Hello everyone. 
I need to create a custom report that will give me information about the policies, using as search filter a part of the policy name. 
the problem is that if I insert the filter "policy => policy name => Conteins = _abd_" the generated report also includes policies that contain the name "_abCd_." 
How can I make sure that the search includes only those policies that contain exactly the characters "_abd_"?

thanks and regards

Valerio