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，我只需要用另一个字符串替换 “pmcKey”字段值。 “pmcKey”：“value .... long”，需要用其他字符串替换“value .... long”。如何做到这一点，通过string.replace走很长的路。如何替换长字符串文本中的特定字符串

{"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}

来源

2017-07-26 user3711357

鉴于这是JSON，我会将它加载为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，最好尽早将数据转换为数据的自然域。 –

假设你的输入是有效的JSON你可以试试这个代码：如果我的假设是错误的，你可以使用正则表达式这样

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：

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)}";

来源

2017-07-26 16:31:52

谢谢。 JObject的作品。实际上，正则表达式不起作用，'oldvalue'可以是任何东西。 – user3711357

尝试正则表达式：

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\""); 

     } 
    } 

}

来源

2017-07-26 16:39:51 jdweng

如何替换长字符串文本中的特定字符串

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