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[Alhazred]

I need to count the number of characters contained into a textarea while I write.
This is how I do, but it also counts the new line characters

$(document).ready(function(){
    $('#testo').keyup(function() {
        $len=$('#testo').val().length;
        $('#counter').text($len)
    });
});

how do I have to modify this code to don't count the new lines?