I want to remove the ul and li tags from this HTML-string but keep the content of them. So only remove the tags themselfs.

```
    <div>
<ul id="preview">
<li class="">
<div class="form-group">
        <div id="action-delete" class="ss-icon ss-trash pull-right" data-title="Delete" data-toggle="tooltip"></div>
        <div id="action-edit" class="ss-icon ss-write pull-right" data-title="Edit" data-toggle="tooltip"></div>
        <h4>Heading</h4>
    </div>
    </li>
</ul>
    </div>

```

**Update**

This HTML is returned to me in a variable. How can I target only this HTML string and not the whole page?