ExtractBetween: Element 2 of the text contains 1 substrings while the previous elements have 0. All elements must contain the same number of substrings.

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LabRat 2022-8-15

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https://ww2.mathworks.cn/matlabcentral/answers/1779945-extractbetween-element-2-of-the-text-contains-1-substrings-while-the-previous-elements-have-0-all

编辑： Stephen23 2022-8-16

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Error using extractBetween (line 79)

Element 2 of the text contains 1 substrings while the previous elements have 0. All

elements must contain the same number of substrings.

files_in_folder = dir('directory/*.mp4');
{files_in_folder.name}
id = extractBetween({files_in_folder.name}, 'file_', '_');

%an example file name would be file_123_test.mp4

The output of {files_in_folder.name} holds and extra file named '.mp4' with no title, just the file extentions mp4. I checked the directory but ther is no such file called '.mp4'.

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Stephen23 2022-8-16

编辑：Stephen23 2022-8-16

" checked the directory but ther is no such file called '.mp4'."

How exactly did you "check" the directory? By unreliably looking at something like MS File Explorer, or reliably using a tool that can actually list all files? If using a reliable tool, please show the command you used and its output.