C# 如何提取html中正则数据

html页面的数据：{"api_url":"/api","lang":4,"api_token":"d900739d15cbfab76a91adf7d2dc70783a7f6b64","salt":"faead70417c8e14d88e273a7b97e68c636d2a46d","uname":"cgs9y011","resourceVersion":"2","signInUrl":"http://www.fj0168.com","group":"059R0sWC3KqoEiXGwmuDixchCSA6JcETI9Wbwk4ke7LsYOvc+jrXMgu6Y6lf3li2","oddsStyles":"111","liveChatEnabled":"0","userStatsEnabled":false}。
然后正则是这个salt\"\:\"(?<salt>\w+)\" ！！！！
求大神指导如何在c#的文本textBox显示我想要的数据！！来代码流程！！

RegexOptions ro = RegexOptions.Singleline | RegexOptions.IgnoreCase;
textBox.Text= Regex.Match(html, reg ro).Groups["salt"].Value;

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