This is easy if we don't use numbered variables (see link below to know why numbered variables usually occur in bad code). The idea is simple: use a cell array and a new loop to iterate over each of 0, 1, etc. Make sure that the cell arrays are preallocated before the loops!
V = 0:4;
C_start = cell(numel(V),maxK);
C_count = cell(numel(V),maxK);
for k = 1:maxK
for n = 1:numel(V)
rgx = sprintf('%d.+?%d',V(k),V(k));
C_start{n,k} = regexp(TrajCompact(k,1),rgx);
C_count{n,k} = cellfun(@numel, C_start{n,k});
end
end
Note that this code is untested, because you did not give any data for us to test code on. Depending on the values that are returned and saved there may be simpler structures.
You should avoid numbered variables, because if it has an index then actually make it an index rather than just part of the variable name. This is the point of the cell array. And do not be tempted to dynamically define those variable names, here are explanations why this is a bad idea:
