Additional test cases have been added.
What about intersecting cases? like 1 0 1 0 or 0 1 0 1 ?
I don't like my best solution. Size of regexp should include its argument size. Otherwise all solutions can have size 10.
Extract leading non-zero digit
Getting the indices from a vector
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Make a 1 hot vector
Sum the numbers on the main diagonal
Distances in a circle
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