I have a problem. I am digitizing the map and I want to distinguish one group of polygons from the other group. The basic difference between them lies in their ID (string). One of them has the ID starting from SE-1-... and the other ones start from SE-2-...
I found some hints here:
Is there any way to separate these 2 groups by this part of the string? Categorizing by ID doesn't make sense, because all polygon get their unique color, which makes a terrible mess.
Function is not valid, the details are in the box below: