MATLAB: What is this symbol? looks empty but not.

empty symbol

I use command: [status,result] = system('arp -a') to get the IP address in my machine, then I want to organize these info into a cell format. but I found that, after I remove the empty cells, there are still some cells looks empty but not.
below is the test code:
    [status,result] = system('arp -a')
    test=regexp(result,' ','split');
    test=test(:);
    ept_sig=[];
sig=1;
for i=1:1:length(test)
   if isempty(test{i})
       ept_sig(sig)=i;
       sig=sig+1;
   end
end
test(ept_sig)=[];
there are some variables in the resulted 'test' that looks like empty, but not.
what is that, is there any way to remove them?
Thanks!
Yu

Best Answer

      test=regexp(result, '\s+','split');
In particular, you were dealing with newline and possibly carriage return as well.
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