How to specify the plot region for plot

Question

I have five curves {k^2 + 2, k^2 + 3, -k^2 + 2, -k^2 + 1, Sqrt[k^2]}, as seen below; how can I get rid of the blue and red ones inside the white region? Is there an option, like in DensityPlot, to specify plot region here to be above the black dashed curve?

Here's the code I used:

Plot[{k^2 + 2, k^2 + 3, -k^2 + 2, -k^2 + 1, Sqrt[  (k^2)], 
  6, -6}, {k, -2, 2}, Frame -> True, AspectRatio -> 1, 
 PlotRange -> {0, 4}, 
 Filling -> {2 -> {{6}, {Yellow}}, 2 -> {{1}, {LightRed}}, 
   1 -> {{3}, {LightBlue}}, 3 -> {{4}, {Green}}, 4 -> {{5}, {Orange}},
    5 -> {{7}, {White}}}, 
 PlotStyle -> {Blue, Red, Red, Blue, {Black, Dashed}}, 
 AxesOrigin -> {-2, 0}]

Answer 1

Use RegionFunction:

Plot[{k^2 + 2, k^2 + 3, -k^2 + 2, -k^2 + 1, Sqrt[k^2], 4.1}, {k, -2, 
  2}, Frame -> True, AspectRatio -> 1, PlotRange -> {0, 4}, 
 Filling -> {4 -> {{5}, Orange}, 4 -> {{3}, Green}, 3 -> {{5}, Green},
    3 -> {{1}, LightBlue}, 5 -> {{1}, LightBlue}, 
   1 -> {{2}, LightRed}, 2 -> {{6}, Yellow}}, 
 PlotStyle -> {Blue, Red, Red, Blue, {Black, Dashed}}, Axes -> False, 
 RegionFunction -> Function[{x, y}, Sqrt[x^2] <= y]]

I also cleaned the Filling.