function [dirs]=get_dirs_from_TDSurl(url_base);
% GET_DIRS_FROM_URL Get subdirectories from a URL directory
% with the datasetScan used to generate the THREDDS catalog, there are
% different things to find in s....
s=urlread(url_base);
f2=strfind(s,'/</tt>');
for i=1:length(f2);
    tmp=s(f2(i)-35:f2(i));
    idx=strfind(tmp,'<tt>');  % <tt> preceeds the file name in all cases
 
    dirs{i}=tmp(idx+4:end);
end