perlquestion
choroba
Most honourable brothers and sisters in Perl. At work, we are having issues with [doc://substr]. It returns strange values when called on the special variable <c>$1</c>.<br>
The following code creates the test script and runs it:
<c>
use strict;
use warnings;
open my $PL, '>', 'utf2.pl' or die $!;
print {$PL} << '__PL__';
##########################################################
use strict;
use warnings;
binmode STDOUT, ':utf8';
binmode STDIN, ':utf8';
while (my $line = <>) {
if (my ($word) = $line =~ /^(.+)$/) {
my $one = substr($1, 0, 1); # doesn't work
my $w_one = substr($word, 0, 1); # works
print "'$one' = '$w_one'\tat $line" unless $one eq $w_one;
}
}
##########################################################
__PL__
open my $OUT1, '>', 'utf1' or die $!;
print {$OUT1} map chr hex, qw/61 61 c5 99 0a c4 8d 0a 61 61 c5 99 0a/;
close $OUT1;
open my $OUT2, '>', 'utf2' or die $!;
print {$OUT2} map chr hex, qw/c4 8d 0a 61 61 c5 99 0a c4 8d 0a/;
close $OUT2;
system "$^X utf2.pl < utf1";
print "\n";
system "$^X utf2.pl < utf2";
</c>
The output is (tested in blead 5.17.3, on x86_64-linux-thread-multi):
<pre>'�' = 'č' at č
'aař' = 'a' at aař
'č�' = 'č' at č
</pre>
Do you have any explanation? Should I submit a bugreport?
<p>Update: Thanks all, [https://rt.perl.org/rt3/Public/Bug/Display.html?id=114410|bugreport] sent.
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