用.net正则去除所有的html源码或者提取出图片地址以及存数据库时的符号替换（如富文本编辑器）

参照了别人的博客~前两个基本照搬qwq

http://www.cnblogs.com/vingi/articles/2447861.html

一、去除所有的html源码，只留下文字。（已试验过）

1、引头文件

using System.Text.RegularExpressions

2、编写函数

public   static   string    NoHTML(string    Htmlstring)   
  {   
  //删除脚本   
   Htmlstring   =    Regex.Replace(Htmlstring,@"<script[^>]*?>.*?</script>","",RegexOptions.IgnoreCase);   
  //删除HTML   
   Htmlstring   =    Regex.Replace(Htmlstring,@"<(.[^>]*)>","",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"([\r\n])[\s]+","",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"-->","",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"<!--.*","",RegexOptions.IgnoreCase);   
    
   Htmlstring   =    Regex.Replace(Htmlstring,@"&(quot|#34);","\"",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"&(amp|#38);","&",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"&(lt|#60);","<",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"&(gt|#62);",">",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"&(nbsp|#160);","   ",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"&(iexcl|#161);","\xa1",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"&(cent|#162);","\xa2",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"&(pound|#163);","\xa3",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,@"&(copy|#169);","\xa9",RegexOptions.IgnoreCase);   
   Htmlstring   =    Regex.Replace(Htmlstring,   @"&#(\d+);","",RegexOptions.IgnoreCase);   
    
   Htmlstring.Replace("<","");   
   Htmlstring.Replace(">","");   
   Htmlstring.Replace("\r\n","");   
   Htmlstring=HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();   
    
  return    Htmlstring;   
   }

二、把html中图片地址提取出来（未实验）

1、先把html的标签符号移除

 public   static   string      ParseTags(string    HTMLStr)   
  {   
  return    System.Text.RegularExpressions.Regex.Replace(HTMLStr,   "<[^>]*>",   "");     
   }  

2、再把图片地址取出来

public   static   string    GetImgUrl(string    HTMLStr)   
                  {   
                          string    str   =   string.Empty;   
                          string    sPattern   =   @"^<img\s+[^>]*>";   
                           Regex    r   =   new    Regex(@"<img\s+[^>]*\s*src\s*=\s*([']?)(?<url>\S+)'?[^>]*>",   
                                   RegexOptions.Compiled);   
                           Match    m   =    r.Match(HTMLStr.ToLower());   
                          if    (m.Success)   
                                   str   =    m.Result("${url}");   
                          return    str;   
                   }  

三、把富文本编辑器里的内容存入数据库时需要进行图片替换 不然会出bug

static public string change(string x)//对富文本编辑器中获取的内容 html标签进行处理，避免它存到数据库的时候被转义
    {
        x = x.Replace("&lt;", "<");//对一些特殊字符进行替换
        x = x.Replace("&gt;", ">");
        x = x.Replace("&quot;", "\"");

        return x;
    }