Check nearby

<!doctype HTML>

<head>
  <meta charset="utf-8" />
</head>

<body>
  <input id="word" type="text" placeholder="mot" value="Bannana">
  <input id="real_word" type="text" placeholder="mot à deviner" value="Banane">
  <button id="check">Check</button>
  <script>
    var dom_word = document.getElementById("word");
    var dom_real_word = document.getElementById("real_word");
    var dom_check = document.getElementById("check");
    dom_check.onclick = function () {
      alert(check_nearly(dom_word.value, dom_real_word.value));
    }
    function check_nearly(word, real_word) {
      if (word == real_word) return 'Bien joué !';
      var regexs = [];
      var i = real_word.length;
      var j = 0;
      while (i--) {
        while (j < real_word.length && j < (i - 1)) {
          var regex = real_word.substr(0, j) + ".{0,2}" + real_word.substr(j + 1, (i - j - 1)) + ".{0,2}" + real_word.substr(i + 1);
          console.log(regex);
          regexs.push(regex);
          j++;
        }
        j = 0;
      }
      for (regex of regexs) {
        console.log(regex);
        var r = new RegExp(regex);

        if (word.match(r)) {
          return 'Presque !';
        }
      }
      return 'Pas du tout';
    }
  </script>
</body>