C# 正则表达式html匹配input标签及匹配input的value及获取aspnet页面VIEWSTATE、EVENTVALIDATION的UI状态保存值

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1、使用正则表达式从html内容中获取 input 标签，然后从 input 标签中获取属性值；

也可以使用正则表达式捕获组获取value，在2中说明

using System.Text.RegularExpressions;

string excelHtml = divMX.InnerHtml;

        Regex reg_Value = new Regex("value=\'.*\'");
        Match match_Value = null;

        Regex reg = new Regex("<input[^<>]+></input>");
        MatchCollection matchCollect = reg.Matches(excelHtml);

        foreach (Match match in matchCollect)
        {
            match_Value = reg_Value.Match(match.Value);
            excelHtml = excelHtml.Replace(match.Value, match_Value.Value.Split('=')[1].Replace('\'',' '));
        }


         reg = new Regex("<input[^<>]+/>");
         matchCollect = reg.Matches(excelHtml);

         foreach (Match match in matchCollect)
         {
             match_Value = reg_Value.Match(match.Value);
             excelHtml = excelHtml.Replace(match.Value, match_Value.Value.Split('=')[1].Replace('\'', ' '));
         }

2、获取aspnet页面VIEWSTATE、EVENTVALIDATION的值，通过正则表达式匹配组的概念

/// <summary>
    /// 获取asp.net页面的隐藏控件值（状态信息与验证信息等）
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    [WebMethod]
    public string GetHiddenField(string url)
    {
        System.Net.WebRequest request = System.Net.WebRequest.Create(url);//获取页面内容
        request.Timeout = 200000;//20秒超时 
        System.Net.WebResponse response = request.GetResponse();
        Stream resStream = response.GetResponseStream();
        StreamReader sr = new StreamReader(resStream);
        string tempstr = sr.ReadToEnd();

        //Regex reg = new Regex("<input type=\"hidden\" name=\"(.*?)\" id=\"(.*?)\" value=\"(.*?)\" />", RegexOptions.IgnoreCase);

        string matchValue = string.Empty;
        string val_VIEWSTATE = string.Empty;
        Regex reg_VIEWSTATE = new Regex("<input type=\"hidden\" name=\"__VIEWSTATE\" id=\"__VIEWSTATE\" value=\"(.*?)\" />", RegexOptions.IgnoreCase);
        Match match = reg_VIEWSTATE.Match(tempstr);
        if (match.Success)
        {
             matchValue = match.Value;//匹配的字符串
             val_VIEWSTATE = match.Groups[1].Value; //匹配的value值，正则表达式中的第一个括号
        }

        string val_VIEWSTATEGENERATOR = string.Empty;
        Regex reg_VIEWSTATEGENERATOR = new Regex("<input type=\"hidden\" name=\"__VIEWSTATEGENERATOR\" id=\"__VIEWSTATEGENERATOR\" value=\"(.*?)\" />", RegexOptions.IgnoreCase);
        match = reg_VIEWSTATEGENERATOR.Match(tempstr);
        if (match.Success)
        {
            matchValue = match.Value;//匹配的字符串
            val_VIEWSTATEGENERATOR = match.Groups[1].Value; //匹配的value值，正则表达式中的第一个括号
        }

        string val_EVENTVALIDATION = string.Empty;
        Regex reg_EVENTVALIDATION = new Regex("<input type=\"hidden\" name=\"__EVENTVALIDATION\" id=\"__EVENTVALIDATION\" value=\"(.*?)\" />", RegexOptions.IgnoreCase);
        match = reg_EVENTVALIDATION.Match(tempstr);
        if (match.Success)
        {
            matchValue = match.Value;//匹配的字符串
            val_EVENTVALIDATION = match.Groups[1].Value; //匹配的value值，正则表达式中的第一个括号
        }

        //MatchCollection mCollection = r6.Matches(tempstr);
        //if (mCollection != null && mCollection.Count > 0)
        //{
        //    val = mCollection[0].Value;
        //    Regex reg_Value = new Regex("value=\".*\"");
        //    Match match_Value = reg_Value.Match(val);
        //    string value = match_Value.Value.Split('=')[1].Replace("\"", "");
        //}

        return tempstr;
    }

3、javascript获取方法

<script type="text/javascript" >
var str="<input  type=\"text\" value=\"12345688\" />";
var ze=/value="(.+?)"/
str=str.match(ze);
alert("value值等于："+str[1])//同样通过捕获组的原理，获取第一个括号内的值，str[0]匹配整个表达式，即value=\"12345688\"
</script>