You could do

$mystring = pack('H*', '0D0A...');
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or

# Ignores whitespace
($mystring = '0D 0A ...') =~ s/([0-9a-fA-F]{2})/chr($1)/g;
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or

# Multiline and ignores whitespace
($mystring = <<'__EOI__') =~ s/([0-9a-fA-F]{2})/chr($1)/g;
0D 0A ...
0D 0A ...
0D 0A ...
...
__EOI__
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print unpack 'u*', '92G5S="!!;F]T:&5R(%!E<FP@2&%C:V5R+```';
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You can use perl to produce the UUE string, from a binary file, for example.

print pack 'u*', $binstring;
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Likewise, you can use a hex string. It doesn't wrap nicely, not without extra measures anyway, and it's longer than UUE: 2x versus 4/3x increase in size.

print pack 'H*', '4A75737420416E6F74686572205065726C204861636B65722C';
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print unpack 'H*', $binstring;
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If it's in a file, you just read the file into the string and don't worry.

From the perlfaq (perldoc -q "How can I read in an entire file all at once?"):

{
  local(*INPUT, $/);
  open (INPUT, $file) || die "can't open $file: $!";
  binmode INPUT; # needed if you are on Windows
  $var = <INPUT>;
}
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You will avoid being biten by Unicode using binmode wherever you need to deal with a stream of bytes; from perldoc -f binmode:

               On some systems (in general, DOS and Windows-based
               systems) binmode() is necessary when you're not
               working with a text file.  For the sake of porta-
               bility it is a good idea to always use it when
               appropriate, and to never use it when it isn't
               appropriate.  Also, people can set their I/O to be
               by default UTF-8 encoded Unicode, not bytes.

               In other words: regardless of platform, use bin-
               mode() on binary data, like for example images.
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Flavio (perl -e 'print(scalar(reverse("\nti.xittelop\@oivalf")))')

Don't fool yourself.

use MIME::Base64 qw( encode_base64  decode_base64);

$ascii_dat = encode_base64($bin_string);

#or reverse

$bin_string_back = decode_base64($ascii_dat);
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