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If I were trying to get just the entries in my current working directory whose names consist entirely of digits, I'd do it like this:
my @digit_dirs = grep /^\d+$/, <*>; print join( "\n", @digit_dirs, "" );
If the entries of interest were in fact all "yyyymmdd" digit strings, I'd replace the "+" in the grep regex with {8}.

In reply to Re: Regex pattern to find directories only with digits by graff
in thread Regex pattern to find directories only with digits by Bindo

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