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  1. or download this
    s/$CR?$LF/\n/;
  2. or download this
    my $CR="\015";
my $LF="\012";
my $foo="unknown_os\n";
$foo =~ s{$CR?$LF}{\n}xms;
print $foo;
  3. or download this
    ? <-- HERE follows nothing in regex; marked by <-- HERE in m/
/ at -e line 4.