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c:\@Work\Perl\monks>perl -wMstrict -e
"my $data = qq{cfg_a\ncfg_b[2:0]\ncfg_c[4:0]\ncfg_d\n};
...
logic [2:0] cfg_b
logic [4:0] cfg_c
logic cfg_d

my $data= qq{cfg_a\ncfg_b[2:0]\ncfg_c[4:0]\ncfg_d\n};
...
...
open my $fh, '<', \$data or die qq{opening string by reference: $!};