I have this JS function that prevents user from typing characters

<script type=text/javascript>

function validate(evt) {

  var theEvent = evt || window.event;

  var key = theEvent.keyCode || theEvent.which;

  key = String.fromCharCode(key);

  var regex = /[0-9]|./;

  if(!regex.test(key)) {

    theEvent.returnValue = false;

    if(theEvent.preventDefault) theEvent.preventDefault();

  }

}

</script>



<span>Radio Receive:</span>

<input name=ReceiveNo type=text class=txtbox onkeypress='validate(event)' maxlength=11 value=${cpCon.receiveNo} required tabindex=34 />

But I noticed that when the user tried to paste a word from this textbox, the text can be entered. How can I prevent this without disabling the paste?