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my @emptyfiles = grep { /^\d+$/ } grep { -f } glob '*';

my @emptyfiles = grep { /^\d+$/ } grep { -f } [ 1 temp.dat testdirecto
+ry 10 resume.wd ]

my @emptyfiles = grep { /^\d+$/ } [1 temp.dat 10 resume.wd ]

my @emptyfiles = [1 10]