How to Remove/Find Word in TextBox Through javaScript

1. Javascript code
  1. function ButtonDisplay_onclick() {
  2. var i;
  3. var words = new Array();
  4. words[0] = "Rakesh";
  5. words[1] = "Rahul";
  6. words[2] = "Riyan";
  7. var s = document.getElementById("DisplayTxt").value;
  8. var s2 = document.getElementById("div_ID ").value;
  9. for (i = 0; i < words.length; i++) {
  10. if (s.match(words[i]) == words[i]) {
  11. document.getElementById("DisplayTxt").focus();
  12. document.getElementById("DisplayTxt").value = "";
  13. }
  14. }
  15. }
2. HTML Code
  1. <div id="div_ID">
  2. <input id="ButtonDisplay" type="button" value="Click On" onclick="return ButtonDisplay_onclick()" /> <input type="text" id="DisplayTxt" />
  3. </div>