使用正则表达式自动匹配并获取所需要的数据

            var str = "系统发码：请求参数：【{"OrderNo":"xxxx","UserName":"xx","UserTel":"xx"}】,请求结果：【{"IsSucceed":false,"Message":"该供应商没有对应的核销员，不允许发码"}】< br > 系统发码：产品【我在测试】编号【1447】发码失败该供应商没有对应的核销员，不允许发码";
            var regStr = "请求结果：【.*"Message.*"(?<message>.*?)"}】.*系统发码";
            Regex reg = new Regex(regStr, RegexOptions.None);
            Match mc = reg.Match(str);
            var result = mc.Groups["message"].Value;
            Console.WriteLine(result);
            Console.ReadKey();

例子2:

            var parIn = "data:image/jpeg;base64,aslkdhfilhweifgaj/skldgfg2ui346";
            var regStr = ".*/(?<message>.*?);.*";
            Regex reg = new Regex(regStr, RegexOptions.None);
            Match mc = reg.Match(parIn);
            var result = mc.Groups["message"].Value;
            Console.WriteLine(result);

显示结果:

jpeg