Re: Encode the subject line in MIME header using Perl 5.6

John Delacour <JD(_at_)BD8(_dot_)COM> writes:
> use MIME::QuotedPrint;
> $qp = encode_qp ($_, '');
> print "=?UTF-8?Q?$qp?=" . $/;
That isn't quite right.
MIME::QuotedPrint does NOT encode space or tab.

RFC2047 says:

"   The "Q" encoding is similar to the "Quoted-Printable" content-
   transfer-encoding defined in RFC 2045.  
...
   (3) 8-bit values which correspond to printable ASCII characters other
       than "=", "?", and "_" (underscore), MAY be represented as those
       characters.  (But see section 5 for restrictions.)  In
       particular, SPACE and TAB MUST NOT be represented as themselves
       within encoded words."

So I use simpler rule scheme which just hex-ifys any non-word chars.


sub encode_q{
    local $_ = shift;
    s{([^0-9A-Za-z-])}{
      join("" => map {sprintf "=%02X", $_} unpack("C*", $1))
     }egox;
    return $_;
}