When you don't specify :utf8 or :encoding(UTF-8), Perl assumes Latin-1 (aka ISO-8859-1): 

$ echo -e "\xC3\xA0" | perl -pne 'BEGIN{binmode STDIN, ":utf8"}'|hexdu
+mp -C
e0

[download]

Latin-1 0xE0 encodes the codepoint U+00E0 LATIN SMALL LETTER A WITH GRAVE, which is the character that the UTF-8 string C3 A0 encodes.

Since your terminal is configured to receive UTF-8 output (I suppose), it doesn't know what to do with perl's non-UTF-8 output, and shows the general "I'm confused" replacement character.

Perl 6 - second systems done right

In reply to Re^3: Unicode problem with some letters by moritz
in thread Unicode problem with some letters by OlegG

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.