How do I find a text from json data value, not consider key?

Question

2.00/5 (2 votes)

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Hi,

How to find if

C#

"join"

text contains only inside Value, not consider Key?

What I have tried:

C#

public bool IsValid()
        {
            string val = "join";
            bool isNotValid = false;
            string jsondata = "{"Id":null,"FName":"Vicky","LName":"Denny","DateofJoining":null,"Date":"2023 - 08 - 01T00: 00:00","CreatedBy":"ICC0000389"}";

            if (jsondata.ToUpper().Contains(val.ToUpper()))
            {
                isNotValid = true;

            }
            return isNotValid;
        }

This line of code

C#

if (jsondata.ToUpper().Contains(val.ToUpper()))

finding "join" from all jsondata. Instead of, how can I find the word from value only?

Thanks

Posted 9-Aug-23 3:23am

Rajesh Kumar 2013

Updated 9-Aug-23 10:58am

v2

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2 solutions

Solution 2

The best way is to use something like Newtonsoft Json.NET[^] to read the whole Json into "sensible" classes and process those, but it could be done with a Regex:

RegEx

(?<Key>".*?":)(("(?<Value>.*?)")|(null))

Will extract all the Key/ value pairs.
To restrict it to a specific value only, replace the value part with the specific item:

C#

string input = "{\"Id\":null,\"FName\":\"Vicky\",\"LName\":\"Denny\",\"DateofJoining\":null,\"Date\":\"2023 - 08 - 01T00: 00:00\",\"CreatedBy\":\"ICC0000389\"}";
string searchFor = "Vicky";
string regex = $"(?<Key>\".*?\":)\"(?<Value>{searchFor})\"";
if (Regex.IsMatch(input, regex))
    {
    Console.WriteLine("Matched");
    }
else
    {
    Console.WriteLine("Not Matched");
    }
}

Posted 9-Aug-23 5:04am

OriginalGriff

Comments

PIEBALDconsult 9-Aug-23 16:48pm

Hmmm... as long as inserting the searchFor value doesn't produce an invalid RegEx.

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PIEBALDconsult · Accepted Answer · 2023-08-09T10:58:00

Your question is a bit vague and should be improved.
Here's another RegEx-based technique, but I don't recommend it as a general solution.

C#

string sought = "join";
string jsondata = @"{""Id"":null,""FName"":""Vicky"",""LName"":""Denny"",""DateofJoining"":null,""Date"":""2023 - 08 - 01T00: 00:00"",""CreatedBy"":""ICC0000389""}" ;

System.Text.RegularExpressions.MatchCollection mat = System.Text.RegularExpressions.Regex.Matches
(
  jsondata
,
  @"(^|\G)(\s|,|\{|\}|\[|\])*((""(?'Name'[^""]+)""\s*:\s*)?((""(?'Value'[^""]*?)"")|(?'Value'\w+)))"
) ;

for ( int i = 0 ; i < mat.Count ; i++ )
{
  System.Text.RegularExpressions.Group val = mat [ i ].Groups [ "Value" ] ;

  if ( val.Success && val.Value.ToLower().Contains ( sought ) )
  {
    // value contains sought text
  }
}