日期:2014-05-17 浏览次数:20578 次
 <p>
        这是一个新闻详细页面
    <img alt="" src="/ImgUpload/images/Awards%20-%20K2.png" style="width: 1280px; height: 699px; " /></p>
            System.IO.StreamReader reader = new System.IO.StreamReader("e:\\1.txt");
            string str = reader.ReadToEnd();
            Regex reg = new Regex(@"(?is)(?<=<img[^>]*?)alt=.*?(?=src=[^<]*?/>)");
            Match m = reg.Match(str);
            str = reg.Replace(str, "alt=%title ");
------解决方案--------------------
            string str = @"<p>
        这是一个新闻详细页面
    <img alt="""" src=""/ImgUpload/images/Awards%20-%20K2.png"" style=""width: 1280px; height: 699px; "" />
    <img alt=""IMGALT"" src=""/ImgUpload/images/Awards%20-%20K2.png"" style=""width: 1280px; height: 699px; "" /></p>";
            string result = Regex.Replace(str, @"(?is)(?<=<img[^>]*?alt=(['""]))(?=\1)", "%title");
            result = Regex.Replace(result, @"(?is)(?<=<img\b)", " title=\"title\"");
            Console.WriteLine(result);