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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div id="log"></div>
<script>
  
 var str = '朝（ちょう）三（さん）暮（ぼ）四（し）';
  
  function parse(curosr) {
      var start = str.indexOf('（', curosr);
      var end = str.indexOf('）', start);
    
      if(start != -1 && end != -1) {
        console.log(start);
        console.log(end);
​
        console.log(str.substring(start+1, end));
​
        parse(end);
      }
​
  }
  
  function parse2(s) {
    s = s.replace(/（/g, '<rt>');
    s = s.replace(/）/g, '</rt>');
    var _html = '<ruby>' + s + '</ruby>';
    console.log(_html);
    if(validRubyText(_html)) {
      document.getElementById('log').innerHTML = _html;
    } else {
      document.getElementById('log').innerHTML = 'die';
    }
  }
  
  function validRubyText(text) {
    var re = new RegExp(['ruby', 'rt'].map(function (el) {
        var openTag = '<' + el + '\\b[^>]*>';
        var closeTag = '<\/' + el + '\\b[^>]*>';
        return openTag + '[\\s\\S]*' + closeTag;
    }).join('|'), 'i');
​
    return re.test(text);
  }
  
  parse2(str);
  
  </script>
</body>
</html>
 
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​
Output

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