onkeyup Validation jQuery

// https://jsfiddle.net/hibbard_eu/vY39r/

$("#amount").on("keyup", function(){
    var valid = /^\d{0,2}(\.\d{0,2})?$/.test(this.value),
        val = this.value;

    if(!valid){
        console.log("Invalid input!");
        this.value = val.substring(0, val.length - 1);
    }
});