Using Tablix Filters with Multiple Values

Hey :)

I'm using Report builder 3.0 in orde to create reports in my work. I cannot seem to figure out the below issue on my own though. 

I'm trying to add a filter to my tablix. I'm going through Tablix properties --> Filters. I select myExpression as "Compare Period", this is where it becomes tricky. I now want to showtwo values. I only want the tablix to show "current" and "prior", I have tried to do this is in several ways.

Example, Operator: Like. Value: *current*; *prior*

Nothing seems to work. Any ideas? All help is highly appreciated!!

Thank you for your time!

Best regards,

Caroline