C# 如何替换长字符串文本中的特定字符串

在下面的表达式中，我只需要替换 “pmcKey”字段值与另一个字符串。 “pmcKey”：“value…long”，需要用其他字符串替换“value…long”。 如何做到这一点，由字符串。替换走了很长的路

{"rd":"1404900091","d":"25994","dddd":99,"pmcKey":"95abcdefgiJBMjU2R0NNS1ciLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiaXYiOiJBQVNNa0lsQ3l6blRsWktiIiwidGFnIjoiUlFuNUhVSWVHMVN0TmxJdXB5SGZNZyIsInppcCI6IkRFRiJ9.6zef568_zt8uZGlOdZZZga0FJV1CJcf-RdEIUk88ZtNyEmVX7eLnuce1nhkROgA03444LRiOxkFLFJ_eW5Um8w.k72DtsRbZzuTqWqOFlacVw.D3Sn9jiKRosZboqE0v999htZuyHu4Eukcq64Df5ga6XEOIOj6vDwR-2_NxzYs58kWpvP999SsXdYfqn1m9--h3lgcJEqOb2z4u_yXzxRWsGQe8kNwdWndFJox699999lQI0djiYAQtkhgqI6hgBS_muWiYar9WpP6K3fxPn99999cXlN6L0RdqWIl_U-wV5mlpMivxfyk0fMVcD1T9GTk99999aHpPPAYJ0pHIOYJjak2tj7J_nK4jPxrw7pNbQ3h2TB71JE5UTs4P9NgsL299999eb2wdJuOgJR9md-8PiGAJvWpgQSQu9HNvGowaTq.9999999991gjk0SQEXxfFBUTJKDANTdVBN52FURbIXQ","id":null,"req":null,"page":1,"CDate":null}

---

假设您的输入是有效的Json，您可以尝试以下代码：

var input = "{\"rd\":\"1404900091\",\"d\":\"25994\",\"dddd\":99,\"pmcKey\":\"95abcdefgiJBMjU2R0NNS1ciLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiaXYiOiJBQVNNa0lsQ3l6blRsWktiIiwidGFnIjoiUlFuNUhVSWVHMVN0TmxJdXB5SGZNZyIsInppcCI6IkRFRiJ9.6zef568_zt8uZGlOdZZZga0FJV1CJcf-RdEIUk88ZtNyEmVX7eLnuce1nhkROgA03444LRiOxkFLFJ_eW5Um8w.k72DtsRbZzuTqWqOFlacVw.D3Sn9jiKRosZboqE0v999htZuyHu4Eukcq64Df5ga6XEOIOj6vDwR-2_NxzYs58kWpvP999SsXdYfqn1m9--h3lgcJEqOb2z4u_yXzxRWsGQe8kNwdWndFJox699999lQI0djiYAQtkhgqI6hgBS_muWiYar9WpP6K3fxPn99999cXlN6L0RdqWIl_U-wV5mlpMivxfyk0fMVcD1T9GTk99999aHpPPAYJ0pHIOYJjak2tj7J_nK4jPxrw7pNbQ3h2TB71JE5UTs4P9NgsL299999eb2wdJuOgJR9md-8PiGAJvWpgQSQu9HNvGowaTq.9999999991gjk0SQEXxfFBUTJKDANTdVBN52FURbIXQ\",\"id\":null,\"req\":null,\"page\":1,\"CDate\":null}";
var json = JObject.Parse(input);
json["pmcKey"] = "other string";
var result = json.ToString();

编辑如果我的假设是错误的，您可以使用如下正则表达式：

var regex = new Regex("\"pmcKey\":\"(?<oldValue>[^\"]+)\"");
var oldValue = regex.Match(input).Groups["oldValue"];
var newValue = "otherValue";
var result = $"{input.Substring(0, oldValue.Index)}{newValue}{input.Substring(oldValue.Index + oldValue.Length)}";

var regex=new regex（“\”pmcKey\“：\”（？[^\“]+）\”）；
var oldValue=regex.Match（输入）.Groups[“oldValue”]；
var newValue=“otherValue”；
var result=$“{input.Substring（0，oldValue.Index）}{newValue}{input.Substring（oldValue.Index+oldValue.Length）}”；

假设您的输入是有效的Json，您可以尝试以下代码：

var input = "{\"rd\":\"1404900091\",\"d\":\"25994\",\"dddd\":99,\"pmcKey\":\"95abcdefgiJBMjU2R0NNS1ciLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiaXYiOiJBQVNNa0lsQ3l6blRsWktiIiwidGFnIjoiUlFuNUhVSWVHMVN0TmxJdXB5SGZNZyIsInppcCI6IkRFRiJ9.6zef568_zt8uZGlOdZZZga0FJV1CJcf-RdEIUk88ZtNyEmVX7eLnuce1nhkROgA03444LRiOxkFLFJ_eW5Um8w.k72DtsRbZzuTqWqOFlacVw.D3Sn9jiKRosZboqE0v999htZuyHu4Eukcq64Df5ga6XEOIOj6vDwR-2_NxzYs58kWpvP999SsXdYfqn1m9--h3lgcJEqOb2z4u_yXzxRWsGQe8kNwdWndFJox699999lQI0djiYAQtkhgqI6hgBS_muWiYar9WpP6K3fxPn99999cXlN6L0RdqWIl_U-wV5mlpMivxfyk0fMVcD1T9GTk99999aHpPPAYJ0pHIOYJjak2tj7J_nK4jPxrw7pNbQ3h2TB71JE5UTs4P9NgsL299999eb2wdJuOgJR9md-8PiGAJvWpgQSQu9HNvGowaTq.9999999991gjk0SQEXxfFBUTJKDANTdVBN52FURbIXQ\",\"id\":null,\"req\":null,\"page\":1,\"CDate\":null}";
var json = JObject.Parse(input);
json["pmcKey"] = "other string";
var result = json.ToString();

编辑如果我的假设是错误的，您可以使用如下正则表达式：

var regex = new Regex("\"pmcKey\":\"(?<oldValue>[^\"]+)\"");
var oldValue = regex.Match(input).Groups["oldValue"];
var newValue = "otherValue";
var result = $"{input.Substring(0, oldValue.Index)}{newValue}{input.Substring(oldValue.Index + oldValue.Length)}";

var regex=new regex（“\”pmcKey\“：\”（？[^\“]+）\”）；
var oldValue=regex.Match（输入）.Groups[“oldValue”]；
var newValue=“otherValue”；
var result=$“{input.Substring（0，oldValue.Index）}{newValue}{input.Substring（oldValue.Index+oldValue.Length）}”；

试试正则表达式：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;


namespace ConsoleApplication68
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = "{\"rd\":\"1404900091\",\"d\":\"25994\",\"dddd\":99,\"pmcKey\":\"95abcdefgiJBMjU2R0NNS1ciLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiaXYiOiJBQVNNa0lsQ3l6blRsWktiIiwidGFnIjoiUlFuNUhVSWVHMVN0TmxJdXB5SGZNZyIsInppcCI6IkRFRiJ9.6zef568_zt8uZGlOdZZZga0FJV1CJcf-RdEIUk88ZtNyEmVX7eLnuce1nhkROgA03444LRiOxkFLFJ_eW5Um8w.k72DtsRbZzuTqWqOFlacVw.D3Sn9jiKRosZboqE0v999htZuyHu4Eukcq64Df5ga6XEOIOj6vDwR-2_NxzYs58kWpvP999SsXdYfqn1m9--h3lgcJEqOb2z4u_yXzxRWsGQe8kNwdWndFJox699999lQI0djiYAQtkhgqI6hgBS_muWiYar9WpP6K3fxPn99999cXlN6L0RdqWIl_U-wV5mlpMivxfyk0fMVcD1T9GTk99999aHpPPAYJ0pHIOYJjak2tj7J_nK4jPxrw7pNbQ3h2TB71JE5UTs4P9NgsL299999eb2wdJuOgJR9md-8PiGAJvWpgQSQu9HNvGowaTq.9999999991gjk0SQEXxfFBUTJKDANTdVBN52FURbIXQ\",\"id\":null,\"req\":null,\"page\":1,\"CDate\":null}";
            string pattern = "\"pmcKey\":\"[^\"]+\"";

            string output = Regex.Replace(input, pattern, "pmc\":\"abc\"");

        }
    }

}

试试正则表达式：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;


namespace ConsoleApplication68
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = "{\"rd\":\"1404900091\",\"d\":\"25994\",\"dddd\":99,\"pmcKey\":\"95abcdefgiJBMjU2R0NNS1ciLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiaXYiOiJBQVNNa0lsQ3l6blRsWktiIiwidGFnIjoiUlFuNUhVSWVHMVN0TmxJdXB5SGZNZyIsInppcCI6IkRFRiJ9.6zef568_zt8uZGlOdZZZga0FJV1CJcf-RdEIUk88ZtNyEmVX7eLnuce1nhkROgA03444LRiOxkFLFJ_eW5Um8w.k72DtsRbZzuTqWqOFlacVw.D3Sn9jiKRosZboqE0v999htZuyHu4Eukcq64Df5ga6XEOIOj6vDwR-2_NxzYs58kWpvP999SsXdYfqn1m9--h3lgcJEqOb2z4u_yXzxRWsGQe8kNwdWndFJox699999lQI0djiYAQtkhgqI6hgBS_muWiYar9WpP6K3fxPn99999cXlN6L0RdqWIl_U-wV5mlpMivxfyk0fMVcD1T9GTk99999aHpPPAYJ0pHIOYJjak2tj7J_nK4jPxrw7pNbQ3h2TB71JE5UTs4P9NgsL299999eb2wdJuOgJR9md-8PiGAJvWpgQSQu9HNvGowaTq.9999999991gjk0SQEXxfFBUTJKDANTdVBN52FURbIXQ\",\"id\":null,\"req\":null,\"page\":1,\"CDate\":null}";
            string pattern = "\"pmcKey\":\"[^\"]+\"";

            string output = Regex.Replace(input, pattern, "pmc\":\"abc\"");

        }
    }

}

---

假设这是JSON，我会将其加载为JSON（例如使用

JObject.Parse

），将其修改为JSON，然后转换回字符串。一般来说，最好尽早转换为数据的自然域。鉴于这是JSON，我会将其加载为JSON（例如，使用

JObject.Parse

），将其修改为JSON，然后转换回字符串。一般来说，最好尽早转换到数据的自然域。谢谢。JObject工作。实际上，正则表达式不起作用，

oldvalue

可以是任何东西。谢谢。JObject工作。实际上，正则表达式不起作用，

oldvalue

可以是任何东西。