# RegionPlot with different boundaries

I would like to plot different regions, some of them with different boundaries. For instance if I use

RegionPlot[{region1, region2}, BoundaryStyle -> {None,Directive[Black,Thick]}]


it does not work.

I was not able to find a workaround. Any idea?

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RegionPlot[{Disk[], Disk[{1, 0}]}, BoundaryStyle -> {