I have tried it in few languages , but \W removes all characters that are not english.
Don't know what it's problem. Here is my code:
Url russian(with russian characters in url):domain.com/ru/search/игра
perl code :$params{$_} =~ s/[\W]//g for keys %params;
another try with encode-decode:
use Encode qw(encode decode);
$params{search_in_page}=decode('utf-8',$params{search_in_page});
$params{$_} =~ s/[\W]//g for keys %params;
$params{search_in_page}=encode('utf-8',$params{search_in_page});

[download]
what can be the problem ?

In reply to Re^4: Strip utf-8 dangerous url chars by AlfaProject
in thread Strip utf-8 dangerous url chars by AlfaProject

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