[CMake] gathering directory names in cmake

[Cfyz]

> I have a source tree which contains multiple directories each of
> which has a subdirectory called "xyz". I want to create a target
> that creates a zip file with each of the xyz directories.

You can filter the file paths with a few CMake script lines:

file(GLOB_RECURSE FILES "./*")
foreach(FILE ${FILES})
    if(FILE MATCHES ".*/xyz/.*")
        list(APPEND XYZ_FILES ${FILE})
    endif()
endforeach()

Now XYZ_FILES contains a list of files with /xyz/ subdirectory somewhere in
their path.
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