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<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title></title>
  <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
</head>
<body>
  <div class="container">
    <form>
      <div class="form-group">
        <label for="exampleInputEmail1">Ввод</label>
        <input type="email" name="full-text" class="form-control">
      </div>
      <div class="form-group">
        <label for="exampleInputPassword1">Результат</label>
        <input type="text" name="part1" class="form-control">
      </div>
      <div class="form-group">
        <input type="text" name="part2" class="form-control">
      </div>
      <div class="form-group">
        <input type="text" name="part3" class="form-control">
      </div>
    </form>
  </div>
</body>
</html>
 
var rexp = /(\d+)(?:\s\/\s([\w\s]+))?(?:,\s(.+))?/;
var fullText = document.querySelector("[name='full-text']");
var part1 = document.querySelector("[name='part1']");
var part2 = document.querySelector("[name='part2']");
var part3 = document.querySelector("[name='part3']");
​
fullText.onkeyup = function() {
  var res = rexp.exec(this.value);
  if (res) {
    part1.value = res[1] || "";
    part2.value = res[2] || "";
    part3.value = res[3] || "";
  }
};
Output

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