If you set up your form properly:
<form accept-charset="utf-8">
the chractes you submit will be sent to the web server in unicode, not in the alternate encoding scheme you describe. It will also help if you put the document itself into UTF-8 as-well by setting the content-type (either in the HTTP header or in a meta-tag) to charset=utf-8.
update

Here are the links I promised:

In addition to the unicode conversion modules mentioned above (Unicode::Map, Unicode::Map8, cpan::Unicode::MapUTF8) you may also want to check out the Text::Iconv module which also provides character set conversion functionality.

In reply to Re: encoding from Unicode to GB by lhoward
in thread encoding from Unicode to GB by dash2

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