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create filedatastore of mat files filtering files by filename pattern

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Is it possible to create a filedatastore of mat files filtering files by filename pattern?
So far I got this:
fds = fileDatastore(dir_save,'ReadFcn',@load,'FileExtensions','.mat','IncludeSubfolders',true);
f=1;
while hasdata(fds)
disp(num2str(progress(fds)*100)
dataarray = read(fds);
if ~isempty(strfind(fds.Files{f},myPattern))
%% do somthing
end
f=f+1;
end
But some mat files I will not be using are really large and therefore slow down the process.
I cannot move all the files to 1 directirory because my directory structure is like:
d01/file1.mat
d01/myPatternFile.mat
d01/othefile.mat
d02/file1.mat
d02/myPatternFile.mat
d02/othefile.mat
etc

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