How do I sort files by part of their filename?
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I have a set of files in a folder and the labelling is
I want to plot the data that is stored in the files but I want both of the files labeled with I=0.5 on one graph and both of the files labeled with I=1.0 on another graph (there are actually a lot more files than this), e.g. I want to sort them according to the value of I. Can this be done using regexp to sort the files or is there a better way?