csv data extract using extractBetween, importdata

There are many .csv files in the folder, below way trying to bring array form but its not working well as expected.

directory_name = uigetdir; % select the data folder location
    %%
    folders={directory_name};
    id_dir =1;
    %     for id_dir=1:length(folders)
    files=dir(folders{id_dir}); % extracted
    
    for id_file=3:length(files)
        files(id_file).parameter(:)=extractBetween(files(id_file).name,'data_Results_','.csv');
        file_path=[folders{id_dir},'/',files(id_file).name];
        content=importdata(file_path,'\t');

And files (56×1 struct with 7 fields), the name column has all rows of .csv data file names like as ' data_Results_Ir_1.csv', Here, I want to get those data file name only without .csv in cell form(data_Results_Ir_1).