text中img标签：

<IMG height=375 alt="" src="" width=500>

<IMG alt="" src="">

匹配img标签的正则表达式：string Pattern = @"<img/s+[^>]*/s*src/s*=/s*([']?)(?<url>/S+)'?[^>]*>";

 匹配img 的src的正则表达式：string Pattern = @"(?<=src/s*=/s*[/'/""]?)(?<url>[http/:]?[^'""]+)";

                          匹配结果：

 

获取text中img的src地址：

        string Pattern = @"(?<=src/s*=/s*[/'/""]?)(?<url>[http/:]?[^'""]+)";

        Regex reg = new Regex(Pattern, RegexOptions.IgnoreCase);

        MatchCollection colMatch = reg.Matches(text文本);

        StringBuilder strImage = new StringBuilder();

        if (colMatch.Count > 0)         {             foreach (Match m in colMatch)             {                  strImage.Append(m.Value).Append(',');

            }

        }

 

匹配text的img,并给img标签加上链接

            string Pattern = @"<img/s+[^>]*/s*src/s*=/s*([']?)(?<url>/S+)'?[^>]*>";

            Regex reg = new Regex(Pattern, RegexOptions.IgnoreCase);

            MatchEvaluator  myEvaluator=new MatchEvaluator(RepleaceReg);             string content = reg.Replace(text文本), myEvaluator);

 

RepleaceReg函数:

       private string RepleaceReg(Match m)

        {             string result=m.ToString();

     if (albumid != -1)

     {

           result="<a href=ImageShow.aspx?albumid=" + albumid + ">" + m + "</a>";

     }       return result;   }