validation problem

[eluser]Skuja[/eluser]
Good morning every one!

I have following form input line:

Code:

<td colspan="2">Valodas kods &lt;input name="code" type="text" value="&lt;?=$this-&gt;validation->code;?&gt;" maxlength="2"></td>

my validation rules for this input:

Code:

$rules['code'] = "trim|max_length[2]|xss_clean";

The problem is that it all works fine (ie. the validation passes) with latin symbols, but when I type in non latin simbols e.g. šš I get following error:

The language code field can not exceed 2 characters in length.

Can someone help to make validation rule for none latin symbols ?