Read Only files (from a directory) that contain a specific string in filename

I have a directory which contains a number of folders, each folder have data from different thermal bands. I need to read only files (from every folder in the directory) that contains B10 in the filename. Any suggestions ? On the left is the list of Folders in my directory and on the right the list of files inside every folder.

Answer 1

[Image Analyst]

This will do it:

folder = pwd; % The current folder, or else wherever you want.
% Get a list of all files.
fileList = dir(fullfile(folder, '*.*'));
allFileNames = {fileList.name}
% Define what pattern you will need in your filenames.
pattern = 'B10';
numFilesProcessed = 0;	% For fun, let's keep track of how many files we processed.
for k = 1 : length(allFileNames)
	% Get this filename.
	thisFileName = fullfile(fileList(k).folder, allFileNames{k});
	% See if it contains our required pattern.
	if ~contains(thisFileName, pattern, 'IgnoreCase', true)
		% Skip this file because the filename does not contain the required pattern.
		continue;
	end
	% The pattern is in the filename if you get here, so do something with it.
	fprintf('Now processing %s\n', thisFileName);
	numFilesProcessed = numFilesProcessed + 1;	% For fun, let's keep track of how many files we processed.
end
fprintf('Done running %s.m.\nWe processed %d files with %s in the name.\n', ...
	mfilename, numFilesProcessed, pattern);

[kounoupaki87]

Thank you for your answer, It works if I am inside the folder, so I have to run it for each file...can you help me to make the loop going for every folder (in my "bigger" folder) and then check the files for the B10

[kounoupaki87]

Oh sorry, that was easy, I did it. Thank you so much!

[Image Analyst]

Have you considered uing two * in dir()

fileList = dir('C:/Your Parent Folder/**.txt');

or using fileDatastore()? Both of these will allow you to get all the files matching the pattern in all subfolders of some top level folder that you give it.

[Stephen23]

"Have you considered uing two * in dir() "

The DIR documentation states that "Characters next to a ** wildcard must be file separators", so the recursion pattern would have to be something like this:

fileList = dir('C:/ParentFolder/**/*.txt');

Note that if recursion is not required then one asterisk will search only the specified level of folders:

fileList = dir('C:/ParentFolder/*/*.txt');

E.g. for the folder/file hierarchy shown in the OP's question:

fileList = dir('C:/ParentFolder/*/*B10*.tif');

Answer 2

[Tom Ruopp]

I just tried to do something similar in R2023a, except I was looking for the word 'Data' in my directory.

This worked for me without using a loop to get just a list of filenames that containted the string I was looking for:

currentFolder = pwd;
% Define your working folder
[myFolder] = uigetdir(currentFolder, 'Select Folder with text Files to ANALYZE');
filePattern = fullfile(myFolder, '*Data*.txt'); % Create full file name 
txtFilesList = dir(filePattern); % Return list of all .txt files in chosen directory
txtFilesNames = {txtFilesList.name}';