高分求解正则表达式

[masterlijianfei]

有一个html文件，里面包含大量伪静态.shtml的超链接，需要把这些超链接扩展名(.shtml)替换为.html的扩展名纯静态格式，但是某些特征的伪静态超链接不需要被替换，如具有以下特征的伪静态超链接都不能被替换：
/Search/Product-abcdsjsjsj.shtml 里面包含特征字符Product-
/Search/News-abcdsjsjsj.shtml 里面包含特征字符News-
/Search/Help-abcdsjsjsj.shtml 里面包含特征字符Help-
/News/Rss-abcsekdjdkuuss.shtml 里面包含特征字符Rss-
/Help/abcsekdjdkuuss-m-1.shtml
/News/abcsekdjdkuuss-m-2.shtml 里面包含特征字符-m-2
/Product/abcsekdjdkuuss-m-1.shtml 里面包含特征字符-m-1

html文件里面其他所有超链接如/Product/ahsjcnsadsjadkjsa.shtml,/News/dhsoafidsfdjs.shtml都要替换为/Product/ahsjcnsadsjadkjsa.html,/News/dhsoafidsfdjs.html

请问正则表达式怎么书写，需要各位大侠的帮忙

[q107770540]

yourhtml=Regex.Replace(yourhtml,@"(?i)(?<=/((?!(?:Product|News|Help|Rss)-).)+(?<!-m-\d))\.shtml",".html");

[q107770540]

void Main()
{
	List<string> list=new List<string>
	{
			"/Search/Product-abcdsjsjsj.shtml",     
			"/Search/News-abcdsjsjsj.shtml",        
			"/Search/Help-abcdsjsjsj.shtml",        
			"/News/Rss-abcsekdjdkuuss.shtml",       
			"/Help/abcsekdjdkuuss-m-1.shtml",
			"/News/abcsekdjdkuuss-m-2.shtml",       
			"/Product/abcsekdjdkuuss-m-1.shtml",    
			"/Product/ahsjcnsadsjadkjsa.shtml",
			"/News/dhsoafidsfdjs.shtml"
	};
	
	Regex reg=new Regex(@"(?i)(?<=/((?!(?:Product|News|Help|Rss)-).)+(?<!-m-\d))\.s(html)");
	list.ForEach(l=>Console.WriteLine("{0}      {1}",l,reg.Replace(l,".$2")));
	
	/*
	/Search/Product-abcdsjsjsj.shtml      /Search/Product-abcdsjsjsj.shtml
	/Search/News-abcdsjsjsj.shtml      /Search/News-abcdsjsjsj.shtml
	/Search/Help-abcdsjsjsj.shtml      /Search/Help-abcdsjsjsj.shtml
	/News/Rss-abcsekdjdkuuss.shtml      /News/Rss-abcsekdjdkuuss.shtml
	/Help/abcsekdjdkuuss-m-1.shtml      /Help/abcsekdjdkuuss-m-1.shtml
	/News/abcsekdjdkuuss-m-2.shtml      /News/abcsekdjdkuuss-m-2.shtml
	/Product/abcsekdjdkuuss-m-1.shtml      /Product/abcsekdjdkuuss-m-1.shtml
	/Product/ahsjcnsadsjadkjsa.shtml      /Product/ahsjcnsadsjadkjsa.html
	/News/dhsoafidsfdjs.shtml      /News/dhsoafidsfdjs.html
	*/
}

[q107770540]

update:

//这样写法应该会更高效一些~
Regex reg=new Regex(@"(?i)(/((?!(?:Product|News|Help|Rss)-).)+(?<!-m-\d)\.)s(html)");
	list.ForEach(l=>Console.WriteLine("{0}      {1}",l,reg.Replace(l,"$1$3")));

[masterlijianfei]

正！已解决!