Make date optional when parsing imagexpress data

[fstur]

When exporting data from the MD imagexpress at the ZMB, we usually don't have a folder with the date. Could we make the date optional when parsing the data?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.80%. Comparing base (ca2c7ac) to head (c79f7a0).
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  Branches      245      245           
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  Misses        268      268           
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[fstur]

Hi @imagejan and @tibuch,
Could we slightly adjust the regex patterns when parsing imagexpress data to make the date optional?
I could also add a small ZMB-dataset & some adjusted tests if that's ok with you.

[imagejan]

Thanks @fstur for the suggestion. It's true that we don't make use of the date column in the resulting _files dataframe in our conversion code.
Is your system producing a folder structure lacking the date, or are these changes to the directory structure introduced later (e.g. by copying only a subset/subfolder)?

I'll merge this to accommodate your use case, please feel free to also set up a test if you have datasets that significantly differ from what we already have.

[fstur]

Thanks @imagejan for merging.
In our system, no date is saved in the folder structure. Where in your case is the date, we have an arbitrary folder-name that is provided by the user.