regexp to return folders

I have a directory with subdirectories, and several of those have a specific naming format. I'd like to extract the folder names of only those but I can't figure out how to return them. For example, assuming I have the parent path containing those sub directories defined as parent_path:

sub_dir_names = cellstr(ls(parent_path))

this returns all of ths sub dirs. Then I'd like to filter out those that do not meet the naming convention 'sub-', where a number appears after the hyphen. I guess regexp is useful here:

regexp(sub_dir_names, 'sub-', 'match')

But this does not do the job. What should I be doing instead? Seems quite simple.

Answer 1

[Stephen23]

Why not just specify the name format to only return names that start with 'sub-', e.g.:

S = dir(fullfile(parent_path,'sub-*'));
D = {S([S.isdir]).name} % only folders starting with 'sub-'

If there are other folder names which also start with sub- but don't have the trailing number, then add this:

X = cellfun(@isempty,regexpi(D,'^sub-\d+'));
D(X) = []