How to parse string with text and value ?

Here is a simplistic approach

static void Main(string[] args)
      {
          string str = "{ Text = Banana, Value = 81,Text = Apple, Value = 11,Text = Orange, Value = 21 }";
          //Convert to KeyValue pairs eg. Banana:81
          var kvps = str.Trim('{', '}').Replace(" ", "").Replace("Text=", "").Replace(",Value=", ":").Split(',');
          //Output them as required.
          foreach (var kvp in kvps)
          {
              var values = kvp.Split(":");
              Console.WriteLine($"Text= {values[0]} Value={values[1]}");
          }

          Console.ReadLine();
      }

Edit

In view of the comment that this method is very inefficient, it may be helpful to show the BenchmarkDotNet test results for processing a test string formatted as in the example. The test method extracted 1000 key value pairs from a single string in a mean time of 0.2056 milliseconds with an allocated memory use of 210.55KB

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.22621
Intel Core i7-8565U CPU 1.80GHz (Whiskey Lake), 1 CPU, 8 logical and 4 physical cores
| Method | Mean     | Error   | StdDev  | Ratio | Rank | Gen 0   | Gen 1  | Gen 2 | Allocated |
|------- |---------:|--------:|--------:|------:|-----:|--------:|-------:|------:|----------:|
| DoWork | 205.6 us | 4.01 us | 7.12 us | 1.00  | 1    | 51.2695 | 0.2441 | -     | 210.55 KB |

public sealed partial class LookupTable : System.IDisposable
{
  private static readonly System.Text.RegularExpressions.Regex reg ;

  static LookupTable
  (
  )
  {
    reg = new System.Text.RegularExpressions.Regex
    (
      @"\{\s*Text\s*=\s*(?'Name'\S+)\s*,\s*Value\s*=\s*(?'Value'\S+)\s*\}"
    ,
      System.Text.RegularExpressions.RegexOptions.Compiled
      |
      System.Text.RegularExpressions.RegexOptions.IgnoreCase
    ) ;

    return ;
  }

  private readonly System.Collections.Generic.Dictionary<string,string> dic ;

  public LookupTable
  (
    string Data
  )
  {
    this.dic = new System.Collections.Generic.Dictionary<string,string>
    (
      System.StringComparer.InvariantCultureIgnoreCase
    ) ;

    System.Text.RegularExpressions.MatchCollection mat = reg.Matches
    (
      Data
    ) ;

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

      this.dic [ nam.Value ] = val.Value ;
    }

    return ;
  }

  public void
  Dispose
  (
  )
  {
    this.dic.Clear() ;

    return ;
  }

  public bool
  TryGetValue
  (
    string     Name
  ,
    out string Value
  )
  {
    return ( this.dic.TryGetValue ( Name , out Value ) ) ;
  }
}