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use v5.12;
use warnings;
...
say "length: ",length $t2;

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# demo_utf8.pl:8: "\xC3\xA5\xC3\xA4\xC3\xB6"                <-- bytes
length: 6
# demo_utf8.pl:14: "\xE5\xE4\xF6"                           <-- code p
+oints
length: 3