Since the first expression glob("$_/f*") is only true for 'dir1', it should only return that element of the directory list (even though glob returns 3 files in that directory).
You are missing the fact that grep puts the glob in a scalar context, and that makes it act as an iterator:
In scalar context, glob iterates through such filename expansions, returning undef when the list is exhausted.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
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