Concatenating text from different text files into one - matlab

Question

Suppose there are five text files. Contents of files are textfile1 = i saw an alligator, textfile2 = alligator was sitting near a tree, textfile3 = alligator was sleeping, textfile4 = parrot was flying, textfile5 = parrot was flying.
I used the code below to find paths of textfiles containing word alligator:
sdirectory = 'C:\Users\anurag\Desktop\Animals\Annotations\';
textfiles = dir([sdirectory '*.eng']);
num_of_files = length(textfiles);
C = cell(num_of_files, 1);
for w = 1:length(textfiles)
file = [sdirectory textfiles(w).name];
%// load string from a file
STR = importdata(file);
BL = cellfun(#lower, STR, 'uni',0);
%// extract string between tags
%// assuming you want to remove the angle brackets
B = regexprep(BL, '<.*?>','');
B(strcmp(B, '')) = [];
%// split each string by delimiters and add to C
tmp = regexp(B, '/| ', 'split');
C{w} = [tmp{:}];
end
where = [];
for j = 1:length(C)
file1 = [sdirectory textfiles(j).name];
if find(ismember(C{j},'alligator'))
where = [where num2str(j) '.eng, '];
disp(file1)
end
end
Finally the variable file1 will show the path of textfile containing word alligator one by one. Is there any way to concatenate the strings of textfiles containing the required word into a cell array.