如何用正则替换css文件路径
 例如： <link href="css/main.css" type="text/css" rel="stylesheet">
替换成
<link href="/path1/path2/css/main.css" type="text/css" rel="stylesheet">
请问这样如何替换呢
------解决方案--------------------
 string str = "<link href=\"css/main.css\" type=\"text/css\" rel=\"stylesheet\">";
            str = Regex.Replace(str, @"(?is)(<link[^>]*?href=[""'])([^""']+)([^>]+>)", "$1/path1/path2/$2$3");
          
------解决方案--------------------
(?i)(?<=<link\s*href=")([^"]+?)(?="[^>]*?>)
string str=@"<link href=""css/main.css"" type=""text/css"" rel=""stylesheet"">";
str=Regex.Replace(str,@"(?i)(?<=<link\s*href="")([^""]+?)(?=""[^>]*?>)",@"/path1/path2/css/main.css");
------解决方案--------------------

 string tempStr = File.ReadAllText(@"C:\Documents and Settings\Administrator\桌面\Test.txt", Encoding.GetEncoding("GB2312"));//读取txt

                string pattern = @"(?i)(?<=<link[^>]*?href=['""])(?:[^/'""]*?/)+([^'""]+?\.[^'""]+?)(?=['""])";

                tempStr = Regex.Replace(tempStr, pattern, "/path1/path2/css/$1");

                /*

                 *  <link href="/path1/path2/css/main.css" type=""text/css"" rel=""stylesheet"">或者

                    <link href="/path1/path2/css/main1.css" type=""text/css"" rel=""stylesheet"">又或者

                    <link href="/path1/path2/css/main2.css" type=""text/css"" rel=""stylesheet"">

                 */

                //