Of course, when using FB_CROAK as the CHECK argument, you normally want to wrap it in an eval: 
my $encoding = "whatever";
my $octets = "characters in whatever encoding...";

eval '$_ = decode( $encoding, $octets, Encode::FB_CROAK )';

if( $@ ) {
    report_an_error();
    ...
}

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In reply to Re^3: utf weirdness in regex by graff
in thread utf weirdness in regex by december

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