test(dscount, ['ab___ab__', 'a', 'b'], 2);
    test(dscount, ['___cd____', 'c', 'd'], 1);
    test(dscount, ['de_______', 'd', 'e'], 1);
    test(dscount, ['12_12__12', '1', '2'], 3);
    test(dscount, ['_ba______', 'a', 'b'], 0);
    test(dscount, ['_a__b____', 'a', 'b'], 0);
    test(dscount, ['-ab-аb-ab', 'a', 'b'], 2);
    test(dscount, ['aAa', 'a', 'a'], 2);

test(dscount, ['-ab-аb-ab', 'a', 'b'], 2);