Can I use regex when I use filter grouping?

Suppose I want to group the data I have into two groups - say GROUP A & GROUP B.
GROUP A has all the rows that has "NAME" staring with 'A' and GROUP B has all the rows that has "NAME" starting with 'B'.
Can I use the Group filtering option to something like this?

reportFilters : [
{
  "uniqueName" : "NAME",
  "groups" : {
  "GROUP A" : [
           "NAME".[A%]
  ],
  "GROUP B" :[
          "NAME".[B%]
  ],
   }
}]