Dynamicall choose from Drop down

I have a form that has data that needs to be entered into a web application, the form has State information in it. The web application has State as Drop Down fields. Currently i am using Predefined "Global Send Key" {DOWN DOWN} to choose the respective state how can i make this dynamic based of the data received in the field like in the web application form state "CA" corresponds "down down 4" i need to make this dynamic, will concatenating the value work? If yes what would be the reg ex?
 
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