C#/JS 利用正则表达式 替换/删除 img 里面的 width height

JS:

function test() {        var str = "<img title=\"\" alt=\"\" align=\"\" src=\"/kindeditor/attached/image/20161214/20161214162554_8001.jpg\" width=\"312\" height=\"312\" />";        str += "<img title=\"\" alt=\"\" align=\"\" src=\"/kindeditor/attached/image/20161214/20161214162554_8001.jpg\" width=\"412\" height=\"412\" />";        str = str.replace(/ height="\d+"/g, " height=\"90\"");// “/”后面的是要替换的字符，“d\+”是数字,最后""里是用来填充的字符        str = str.replace(/ width="\d+"/g, " width=\"90\"");        alert(str);        }

 <input type="button" id="hh" onclick="test();" value="hell" />

C#：

var str = "<img title=\"\" alt=\"\" align=\"\" src=\"/kindeditor/attached/image/20161214/20161214162554_8001.jpg\" width=\"312\" height=\"312\" />";str += "<img title=\"\" alt=\"\" align=\"\" src=\"/kindeditor/attached/image/20161214/20161214162554_8001.jpg\" width=\"412\" height=\"412\" />";Regex reg = new Regex("width\\s*=\\s*\\S+ height\\s*=\\s*\\S+");                        string result = reg.Replace(str, "width=\"90\" height=\"90\"");                       第二种方法替换                       //Regex reg1 = new Regex("height\\s*=\\s*\\S+");//string result1 = reg1.Replace(result, "height=\"90\"");

处理多张图片中出现没有width height的情况：

//正则替换图片的宽高                                        Regex regImg = new Regex(@"<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""']?[\s\t\r\n]*(?<imgUrl>[^\s\t\r\n""'<>]*)[^<>]*?/?[\s\t\r\n]*>", RegexOptions.IgnoreCase);                                        MatchCollection matches = regImg.Matches(item.AdImg);                                        var relImg = string.Empty;                                        foreach (Match m in matches)                                        {                                            //进行匹配img是否存在width height                                            Regex reg = new Regex("width\\s*=\\s*\\S+ height\\s*=\\s*\\S+");                                            if (!reg.IsMatch(m.Value))//img 中不存在width height                                            {                                                   //获取其他属性进行替换                                                Regex reg1 = new Regex("alt\\s*=\\s*\\S+");                                                relImg += reg1.Replace(m.Value, "style=\"width:90px;height:90px;\"");                                            }                                            else                                            {                                               relImg+= reg.Replace(m.Value, "style=\"width:90px;height:90px;\"");                                            }                                        }