Validando caracteres extraños en un input

invalid_chars.js

(function($){

$.fn.invalid_chars = function(){
    return this.each(function(){
        var obj = $(this);
     
        obj.unbind("keyup");
        obj.bind("keyup",function (e){
        var val = $(this).val();
        var regex = /[\%\(\)\:\%\<\>\$\&\=\?\¿\"\#\·\ç\}\{\`\^]+/;

        var is_valid = !regex.test(val);
        console.log(is_valid, val, $(this));
        if(!is_valid){
            val = val.replace(regex, "");

        }
        $(this).val(val);
        });
    });
}


$(document).ready(function(){

$("input:text").invalid_chars();
});
})(jQuery);