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  1. or download this
    $mystring = pack('H*', '0D0A...');
  2. or download this
    # Ignores whitespace
($mystring = '0D 0A ...') =~ s/([0-9a-fA-F]{2})/chr($1)/g;
  3. or download this
    # Multiline and ignores whitespace
($mystring = <<'__EOI__') =~ s/([0-9a-fA-F]{2})/chr($1)/g;
...
0D 0A ...
...
__EOI__