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<div css="a"> 1</div>
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<div css="b">1.1</div>
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<div css="b">1.2</div>
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<div css="a">2</div>
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<div css="b">2.1</div>
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<div css="b">2.2</div>
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C# code:
>(?<droplist>[^<]+)</div>(?<content>[^<]+)


droplistÄÚΪ1 1.1¡­¡­¡­¡­¡­¡­ contentÄÚΪXXµÄÄÚÈÝ

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public string DealHtml(string str)

¡¡¡¡{

¡¡¡¡//str = Regex.Replace(str, @"\<(img)[^>]*>|<\/(img)>", "", RegexOptions.IgnoreCase);

¡¡¡¡str = Regex.Replace(str, @"\<(table|tbody|tr|td|th)[^>]*>|<\/(table|tbody|tr|td|th)>", "", RegexOptions.IgnoreCase);

¡¡¡¡str = Regex.Replace(str, @"\<(div|blockquote|fieldset|legend)[^>]*>|<\/(div|blockquote|fieldset|legend)>", "", RegexOptions.IgnoreCase);

¡¡¡¡//str = Regex.Replace(str, @"\<(font|i|u|h[1-9]|s