What is in your  @Goodlines array? The code posted by stevieb seems to work exactly as advertised: 

c:\@Work\Perl>perl -wMstrict -MData::Dump -le
"my @lines = ('', ' ', '  ', 'x', ' x', 'x ', ' x ', '  x  ',);
 ;;
 my @no_empties = grep { $_ !~ /^(?:\s+|)$/ } @lines;
 ;;
 dd \@no_empties;
"
["x", " x", "x ", " x ", "  x  "]

[download]
Can you put something into the  @lines array that doesn't come out as you want?

Incidentally, I would prefer an inverse approach to the regex: a non-blank line is one that has at least one non-blank (i.e., non-whitespace, or \S) character in it: 

c:\@Work\Perl>perl -wMstrict -MData::Dump -le
"my @lines = ('', ' ', '  ', 'x', ' x', 'x ', ' x ', '  x  ',);
 ;;
 my @no_empties = grep m{\S}xms, @lines;
 ;;
 dd \@no_empties;
"
["x", " x", "x ", " x ", "  x  "]

[download]

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: Perl modifying output of an array to remove blank lines by AnomalousMonk
in thread Perl modifying output of an array to remove blank lines by namelessjoe

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