I call perl bug. The following also demonstrates the odd behavior. Interestingly, the substr(lc($str),0) in the second iteration is limited to the length of the (correct) substr(lc($str),0) in the first iteration.

e.g. with an argument of 'a:bc', the 'bc' is cut down to 'b' (the length of 'a'). For 'ab:cde' or 'ab:cdefgh', the 'cde' and 'cdefgh' are cut down to 'cd' (the length of 'ab').

#!/usr/bin/perl -l
use strict;
use warnings;
use Encode qw/_utf8_on/;
for my $str (split /:/, shift||'a:bc') {
    _utf8_on($str);
    print "$str\t", substr(lc($str), 0);
#   use Devel::Peek; Dump substr(lc($str),0);
}

[download]

For someone familiar w/ perlguts (not me), uncomment the Devel::Peek line.

UPDATE: Expected output for input of x:yz is:

x x
yz yz

[download]
, but due to bugginess, it's:
x x
yz y

[download]

Also, the problem presents in v5.8.7 linux, but not in v5.8.0 solaris, if those are helpful data points.

In reply to Re: XML::Twig handlers weirdness? by benizi
in thread XML::Twig handlers weirdness? by gjb

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.