Hello Perl Monks,

I have a question regarding a very strange behavior which implies the bytes pragma and two UTF-8 strings.

Bellow is the code which illustrates the problem:

use utf8;
use 5.010;
use strict;
use warnings;

binmode(STDOUT, ':encoding(UTF-8)');

sub get_bytes {
    my ($string) = @_;

    use bytes;
    map { bytes::ord bytes::substr($string, $_, 1) } 0 .. bytes::lengt
+h($string) - 1;
}

my $s1 = "møøse";
my $s2 = "m\xF8\xF8se";

say $s1;
say $s2;

say "Equal: ", $s1 eq $s2;

say join(" ", get_bytes($s1));
say join(" ", get_bytes($s2));

[download]

The output (with perl-5.22.0):

møøse
møøse
Equal: 1
109 195 184 195 184 115 101
109 248 248 115 101

As shown, the strings are equivalent in UTF-8, but they become different once they are converted into bytes.

Is this a bug or do I miss something important in this conversion? Thanks!

Update: by replacing "m\xF8\xF8se" with decode_utf8(encode_utf8("m\xF8\xF8se")) it seems to work as expected.

In reply to UTF-8 strings and the bytes pragma by trizen

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