MATLAB filename separation - matlab

Question

In filename "name" like '10_m1_m2_const_m1_waves_20_90_m2_waves_90_20_20200312_213048' I need to separate
'10_m1_m2_const_m1_waves_20_90_m2_waves_90_20' from '20200312_213048'
name_sep = split(name,"_");
sep = '_';
name_join=[name_sep{1,1} sep name_sep{2,1} sep .....];
is not working, because a number of "_" are variable.
So I need to move a file:
movefile([confpath,name(without 20200312_213048),'.config'],[name(without 20200312_213048), filesep, name, '.config']);
Do you have any idea? Thank you!

Answer 1

Maybe you can try regexp to find the starting position for the separation:
ind = regexp(name,'_\d+_\d+$');
name1 = name(1:ind-1);
name2 = name(ind+1:end);
such that
name1 = 10_m1_m2_const_m1_waves_20_90_m2_waves_90_20
name2 = 20200312_213048
Or the code below with option tokens:
name_sep = cell2mat(regexp(name,'(.*)_(\d+_\d+$)','tokens','match'));
which gives
name_sep =
{
[1,1] = 10_m1_m2_const_m1_waves_20_90_m2_waves_90_20
[1,2] = 20200312_213048
}

Answer 2

You can use strfind. Either if you have a key that is always present before or after the point where you want to split the name:
nm = '10_m1_m2_const_m1_waves_20_90_m2_waves_90_20_20200312_213048';
key = 'waves_90_20_';
idx = strfind(nm,key) + length(key);
nm(idx:end)
Or if you know how may _ are in the part that you want to have:
idx = strfind(nm,'_');
nm(idx(end-2)+1:end)
In both cases, the result is:
'20_20200312_213048'

Answer 3

As long as the timestamp is always at the end of the string, you can use strfind and count backwards from the end of the string:
name = '10_m1_m2_const_m1_waves_20_90_m2_waves_90_20_20200312_213048';
udscr = strfind(name,'_');
name_date = name(udscr(end-1)+1:end)
name_meta = name(1:udscr(end-1)-1)
name_date =
'20200312_213048'
name_meta =
'10_m1_m2_const_m1_waves_20_90_m2_waves_90_20'