求一正则, 得正确答案马上结贴

[honkerhero]

现有HTML字符串
<SPAN Class="c1">
<div><span class="c2"></span>abc<span class="c2"></span>
</div>
</span>

想要结果:
<div><span class="c2"></span>abc<span class="c2"></span>
</div>

如何把最外边的span标记去掉, 换句话说, 把有内容的span标记去掉, 补充一句,class的值是不定的, 原则就是去掉包含内容的span标记, 只去标记, 内容还留在原地.

如何正确匹配开始与结束?

我现在这样写的
Regex.Replace(html3 , "<span style=\"white-space: pre;\" class=\"Apple-tab-span\">(.*?)</span>", "$1", RegexOptions.IgnoreCase);
结束标记匹配错误

[honkerhero]

GROUP取出来了, 怎么替换?

[huangwenquan123]

[Quote=引用 9 楼 的回复:]
GROUP取出来了, 怎么替换?
[/Quote]喔 你是要替换，

            string str = @"fdsafsdfsdfa<SPAN Class=""c1"">
<div><span class=""c2""></span>abc<span class=""c2""></span>
</div>
</span>asdfasdfasd
<SPAN Class=""c1"">
<div><span class=""c2""></span>abc<span class=""c2""></span>
</div>
</span>fsad
";
            Regex reg = new Regex(@"(?is)\s*<span[^>]*?>((?:(?<Open>)<span[^>]*?>|(?<-Open>)</span>|(?:(?!</?span).)*)*)(?(Open)(?!))</span>\s*");
            str = reg.Replace(str, "$1");
            Console.WriteLine(str);

[honkerhero]

谢谢两位正则高手, 每人100分

[honkerhero]

再问一下, 能不能把前半截补全, 把后半截去掉, 变成下边的样子

fdsafsdfsdfa<SPAN Class=""c1""></span>
<div><span class=""c2""></span>abc<span class=""c2""></span>
</div>
asdfasdfasd
<SPAN Class=""c1""></span>
<div><span class=""c2""></span>abc<span class=""c2""></span>
</div>
fsad

[honkerhero]

啊, 人呢

[huangwenquan123]

内容只有这样吗？

string result = Regex.Replace(str, @"(?is)<span[^>]*?>(.+)</span>", "$1");

[人生难得一只鸡]

[code=C#]string pattern = @"(?i)(?<=<SPAN Class=""c1"">)[\s\S]*(?=</span>)";
               string tempStr = Regex.Match(tempStr,pattern).Value;

[/code]

[honkerhero]

不是, 系统中可能有很多这样的标记, 但原则就是把span中的内容从中拿出来

[honkerhero]

我怎么写的.* .......

[honkerhero]

<SPAN Class="c1">
<div><span class="c2"></span>abc<span class="c2"></span>
</div>
</span>
<SPAN Class="c1">
<div><span class="c2"></span>abc<span class="c2"></span>
</div>
</span>
这样的话, 会把头和尾去掉, HTML格式乱了

[huangwenquan123]

试试看...

            string str = @"<SPAN Class=""c1"">
<div><span class=""c2""></span>abc<span class=""c2""></span>
</div>
</span>
<SPAN Class=""c1"">
<div><span class=""c2""></span>abc<span class=""c2""></span>
</div>
</span>
";
            Regex reg = new Regex(@"(?is)<span[^>]*?>[^<>]+((?:(?:(?<Open><[^>]+?>)[^<>]*)*(?:(?<-Open></[^>]+?>)[^<>]*)*)*)(?(Open)(?!))</span>");
            foreach (Match m in reg.Matches(str))
                Console.WriteLine(m.Groups[1].Value);

[人生难得一只鸡]

string tempStr = File.ReadAllText(@"C:\Documents and Settings\Administrator\桌面\Test.txt", Encoding.GetEncoding("GB2312"));//读取txt
                Regex reg = new Regex(@"(?isx)                      #匹配模式，忽略大小写，“.”匹配任意字符

                      <span[^>]*>                      #开始标记“<span...>”

                          ((?>                         #分组构造，用来限定量词“*”修饰范围

                              <span[^>]*>  (?<Open>)   #命名捕获组，遇到开始标记，入栈，Open计数加1

                          |                           #分支结构

                              </span>  (?<-Open>)      #狭义平衡组，遇到结束标记，出栈，Open计数减1

                          |                           #分支结构

                              (?:(?!</?span\b).)*      #右侧不为开始或结束标记的任意字符

                          )*                          #以上子串出现0次或任意多次

                          (?(Open)(?!)))               #判断是否还有'OPEN'，有则说明不配对，什么都不匹配

                      </span>

                      ");


                tempStr = reg.Replace(tempStr, a =>
                {
                    return a.Groups[1].Value;

                });
 /*
                 * <div><span class="c2"></span>abc<span class="c2"></span>
                    </div>


                    <div><span class="c2"></span>abc<span class="c2"></span>
                    </div>
                 */