Method to read in file directory as a list of char arrays and it can be used to find certain files versus concatenating strings.

file_search.m

clc; clear all; close all;

file_names = dir;
file_idx = 1;
desired_string = 'slice';

for i = 1:length(file_names)
    name = file_names(i).name;
    if findstr(desired_string, name)
        % Do stuff with name here.
        file_idx = file_idx + 1;
    end
end