List all files in a directory given a regular expression / a set of extensions (Matlab)

Question

I have a regular expression defining the filenames of interest. What is the best way to list all files in a directory that match this condition?

My attempt at this i

Answer 1

My loop variation:

ext = [".doc",".docx",".rtf"];
f = [];
for e = ext
    f = [f;dir(char(strcat('**/*',e)))];
end
f = f([f.isdir] == 0);