use encoding 'utf8';
use HTML::Entities 'decode_entities';

my $string = 'Hello ä/ä ... ß,é';

$string =~ s/(.)/ord($1)>160?'&#'.ord($1).';':$1/ge;

print "$string\n";                     # encoded
print decode_entities($string),"\n";   # decoded

[download]
The principle is this: 
use encoding 'utf8';
print '&#' . ord('ä') . ';';   # prints ä

[download]

In reply to Re: How to encode special characters like ä,ß,é,... in html unicode codes like ä or ä by trizen
in thread How to encode special characters like ä,ß,é,... in html unicode codes like ä or ä by yeehaw

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