I have a plot that includes a `RegionPlot`. I want to make a rectangle with the same shading as in the region plot to show as a legend. The dumb way I can think off is to make another region plot over a small rectangular space and show that as a legend, but that does not seem like a great idea considering I might want to change the plots.

Any better suggestions? 

For practice, I want to label the following example:

```
RegionPlot[x^2 + y^3 < 2, {x, -2, 2}, {y, -2, 2}, 
  MeshFunctions -> {(2 #1 - #2) &, (2 #1 - #2) &}, Mesh -> 100]

```

*Keywords:* hatched filling, legend with hatched filling