MATLAB: Cut part of filename using delimiter

Question

Hello,

i have files:

001_m1_60_const_20200611_200515_SNR_5_PLL.mat
001_m1_60_const_20200611_200515_SNR_10_PLL.mat
001_m1_60_const_20200611_200515_SNR_15_PLL.mat
001_m1_60_const_20200611_200515_SNR_20_PLL.mat
001_m1_60_const_20200611_200515_SNR_25_PLL.mat
001_m1_60_const_20200611_200515_SNR_30_PLL.mat

The problem is, sometimes is a dataname longer or shorter, for exemple:

008_m3_m4_m1_m2_ramp_const_20200111_200415_SNR_25_PLL.mat

I need to cut "_SNR_30_PLL" and get just a:

001_m1_60_const_20200611_200515.mat

my code is not dynamic, and works just with special name length:

name_sep = split(name,"_");
sep = '_';
name_join=[name_sep{1,1} sep name_sep{2,1} ...... .mat];

so i have to join all pieces, witout last three.

How it is works?

Thank you!

Answer 1

If you're using R2016b or later, extractBefore might be a good option.

newStr = extractBefore(name, "_SNR");
name_join = strcat(newStr, ".mat");