Regex match and Backwards Parsing

Heres the section of code i need to parse data from in an html source:

Code:

---

  <li class="comment"
        data-tag="R"
      data-author-viewing=""
      data-id="6vjI8OA5Lv7RkjBnqcOaIoSjCIxT4qpNYSCBT80a590"
      data-score="28"
      data-author="timmymcfunn">


    <div class="content">

        <div class="comment-text" dir="ltr">
          <p>must... not... blink...</p>

        </div>
    </div>

---

What im trying to do is perfrom a regex match to locate particular blocks of this code, locating by matching the input between <p></p> tags. And the data i need to grab is the data-id/score/tag. But how can i grab data behind the location im matching to? My regex.match can bring me to the comment block i need data from, but how do i go about parsing backwards since the data i need for that comment is located backwards.