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这种正则表达式如何写?求高手解答

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Release: 2016-06-13 12:31:12
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这种正则表达式怎么写?求高手解答!
有一个网页中的代码如下:

<span class="1"><br />
      <h3 class="title">testtesttesttesttesttestt</h3><br />
      <div class="con"><br />
            <span>testtesttest</span><p>testtesttesttesttesttesttesttesttest</p><br />
      </div><br />
</span><br />
<div class="2"><br />
      <h3 class="title">testtesttesttesttesttestt</h3><br />
      <div class="con"><br />
            <span>testtesttest</span><p>testtesttesttesttesttesttesttesttest</p><br />
      </div><br />
</div><br />
<div class="3"><br />
      <h3 class="title">testtesttesttesttesttestt</h3><br />
      <div class="con"><br />
            <span>testtesttest</span><p>testtesttesttesttesttesttesttesttest</p><br />
      </div><br />
</div><br />
<span class="4"><br />
      <h3 class="title">testtesttesttesttesttestt</h3><br />
      <div class="con"><br />
            <span>testtesttest</span><p>testtesttesttesttesttesttesttesttest</p><br />
      </div><br />
</span><br />
...
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大家注意到没有 class="1",class="2",class="3",...是有规律的,但是前面的标签没有规律,有时是span,有时是div,我想要的是用php如何写正则表达式获取class="1",class="2",class="3",...的内容,正则表达式这方面学的不好,试了半天都写不出来,求高手解答!

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