Remove Invalid Characters when Text is Pasted from ClipBoard using JavaScript

There is no way to validate what to is to be pasted. But after pasting you can clean the content as show in the below code

<script type="text/javascript">
        function clean(t) {
            t.value = t.value.toString().replace(/[^a-zA-Z 0-9\n\r]+/g, '');
        }
    </script>
    <input type="text" id="text1" onchange = "clean(this)" />