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sub convert_to_html_entities {
   my $str= shift;
   utf8::decode($str);
   $str =~ s/[\x{201A}-\x{2122}]/ '&#'.ord($&).';' /ger;
}

sub convert_nonascii_to_html_entities {
   my $str= shift;
   utf8::decode($str);
   $str =~ s/[^\x20-\x7E]/ '&#'.ord($&).';' /ger;
}