php 正则表达式获取ul标签下的a标签，div标签和span标签的字段。还有a标签中href的链接

<ul class="r"><li>
<a href="./28190285/?i=4&from=cancer" rel="chapter" ref="linksrc=docsum_title">The issues regarding postoperative adjuvant therapy and prognostic risk factors for patients with stage I-II cervical cancer: A review.</a>
<div class="pub_type">Review article</div>
<span class="aux light_narrow_text">Takekuma M, et al.
J Obstet Gynaecol Res. 2017</span>
</li>

 $Html = '<ul class="r"><li>
      <a href="./28190285/?i=4&from=cancer" rel="chapter" ref="linksrc=docsum_title">The issues regarding postoperative adjuvant therapy and prognostic risk factors for patients with stage I-II cervical cancer: A review.</a>
      <div class="pub_type">Review article</div>
      <span class="aux light_narrow_text">Takekuma M, et al.
                    J Obstet Gynaecol Res.  2017</span>
    </li>';
 
 $Html = preg_replace('/\s{2,}/', '', $Html);
 preg_match_all('/<a[^>]*href\s?=\s?[\'"]([^\'"]*)[^>]*>([^<]*)<\/a><div[^>]*>([^<]*)<\/div><span[^>]*>([^<]*)<\/span>/is', $Html, $Arr);
 print_r( $Arr );

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