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  1. or download this
    my $string = qw(ITEM-####);
$string =~ s/#/\d/g;
  2. or download this
    my $string = qw(ITEM-####);
$string =~ s/#/\\d/g;
  3. or download this
    my $esc = qw(\d);
my $string = qw(ITEM-####);
$string =~ s/#/$esc/g;