How do I iterate through many .txt files and ignore part of the name?

So I am trying to analyze data that is saved and stored in many .txt files. The .txt files are indexed by one part of the name (one variable, basically), changing in a linear way, so I just loop through them. There is one issue: as each file gets generated, it gets saved with a timestamp down to the second (I cannot change this) as the first 13 characters in the name. Is there a way to tell Matlab that these 13 characters can be anything but that they don't matter? I am on OS X if that helps. Basically, the code is as shown below.

In filename, the first 13 characters (12 digits and the space) I have to manually delete from the file name in order to analyze this data; it is incredibly annoying. The actual, as-saved file name is, for example, '201001150802 File_name_here_blah_blah_B200F250S250O7000D800P-4y.txt' and the number between B and F I iterate through. Is there a way to ignore or allow any character for the first thirteen characters?

path = ['/Users/me/Dropbox/Company/Data/Sample_Data_Folder/'];

B = 200:10:1900; 
for j = 1:length(B)
    filename = ['File_name_here_blah_blah_B' sprintf('%d',B(j)) 'F250S250O7000D800P-4y.txt'];
    filestring = strcat(path,filename);
    array = textread(filestring); %Use textread for .txt files
    x_data = array(:,1); %I use these to plot.
    y_data = array(:,2); 
end

Answer 1

[Mario Malic]

You can use dir function.

Dir_files = dir('*4y.*txt'); % wildcard, add as many chars as necessary to get needed files
List_Files = {Dir_files.name}'; % Cell (length(Dir_files), 1) that contain filenames to read

[Rik]

If you don't want to iterate through all files, you could use regexp or contains to find out which of the file names in List_Files you need.

[Blenndrman]

Thanks for taking the time. I will say, I am still confused on implementation. Would my code look something like this?

Dir_files = dir('*blah_blah*.txt'); %To get files with blah_blah in them
List_Files = {Dir_files.name}'; %Store all the names here

And then access and iterate through the structure in the loop? Because that is not working for me. I am thinking Matlab does not know how to understand that dir should be looking in the folder specified in path. I do not know how to tell dir which folder to look in.

[Rik]

How are you creating the folder name? This should work as expected:

dir(fullfile(path,'*y4*'))

Note that your variable path is shadowing the built-in function.