find repeating sentence

by Simplybj

HTML

<div id="testRepSentence">
  this is a test
</div>

JavaScript

var cleanString = string.replace(/[\.,-\/#!$%\^&\*;:{}=\-_`~()]/g, "");
      cleanString = cleanString.replace(/(<([^>]+)>)/ig, ""); //remove HTML tags               
      var frequencies = {},
        word, frequency, i;
      var sentences = cleanString.split('.');
      var length = sentences.length;
      var repeatedTwoWords = [];
      for (i = 0; i < length; i++) {
        var word = sentences[i].trim();
        if (word.length > 0) {
          var repSearch = newSentence[i] + newSentence[i + 1];
          var count = sentences.indexOf(repSearch);
          //if (count > 1) {
          repeatedTwoWords.push(repSearch);
          //}
        }
      }
      alert(repeatedTwoWords.length);
      $('#testRepSentence').html(repeatedTwoWords.toString());