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How to use regexp to filter the following file names?

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Hello, lets assume that I have the following file format for my files,
fig_figure_mat2007_03_04_yield_2007_03_05
fig_figure_mat2008_03_07_yield_2008_03_08
fig_figure_mat2007_03_05_yield_2007_03_06
fig_figure_mat2008_04_05_yield_2008_04_06
How can I use regexp in this to sort the files out just by using the first bit of the date such as files are sorted in following order:
2007_03_04
2007_03_05
2008_03_07
2008_04_05

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Accepted Answer

convert_to_metric
convert_to_metric on 10 Jun 2019
Hi Devarshi,
Since your filenames have a predictable structure of consistent length, you could use hard coded indexing to extract that date and avoid regexp altogether. If filename is a character array containing fig_figure_mat2007_03_04_yield_2007_03_05, filename(15:24) should return the section you're looking for.

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