char list to accept from user

gistfile1

    function inputOnlyLetters () {
        var re_letters= /^[ ABCÇDEFGHIJKLMNÑOPQRSTUVWXYZabcçdefghijklmnñopqrstuvwxyzàáãÃÀÁéèÈÉíìÍÌïÏóòõÕÓÒúùÚÙüÜ]+$/gi;
        var re_not_letters= /[^ ABCÇDEFGHIJKLMNÑOPQRSTUVWXYZabcçdefghijklmnñopqrstuvwxyzàáãÃÀÁéèÈÉíìÍÌïÏóòõÕÓÒúùÚÙüÜ]/gi;

        $('.not-number').on('keyup', function() {
            var input =  this;

            // user needs some time to write chars that need two strokes, like ç => ' + c
            window.setTimeout(function(){
                if (!re_letters.test(input.value)) {
                    input.value = input.value.replace(re_not_letters, '');
                }
            }, 800);

        });
    }