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        # See RFC 1867, 2183, 2045
        # NB: File content will be loaded into memory should
        # content-disposition parsing fail.
...
    $filename ||= ''; # quench uninit variable warning

        $filename =~ s/^"([^"]*)"$/$1/;

my ( $param ) = $unfold =~ m/form-data;\s+name="?([^\";]*)"?/;
      my ( $filename )
       = $unfold =~ m/name="?\Q$param\E"?;\s+filename="?([^\"]*)"?/;

my $VAR1 = "POST http://localhost/cgi-bin/upload_quotes.pl\nContent-Le
+ngth: 138\nContent-Type:".
        " multipart/form-data; boundary=xYzZY\n\n--xYzZY\r\nContent-Di
+sposition: form".
        "-data; name=\"file\"; filename=\"stupid \\\"quoted\\\" filena
+me.txt\"\r\n-Content:".
        " stupid content\r\n\r\n\r\n--xYzZY--\r\n";

value := token / quoted-string
token  :=  1*<any (ASCII) CHAR except SPACE, CTLs,
...
               ; Must be in quoted-string,
               ; to use within parameter values

FWS             =       ([*WSP CRLF] 1*WSP) /   ; Folding white space
                        obs-FWS
...
 
quoted-string   =       [CFWS]
                        DQUOTE *([FWS] qcontent) [FWS] DQUOTE