Regex with {}

gistfile1.txt

void Main()
{
    var input = @"{TEST} is {TEST}";
    
    ObtainTokens(input).Dump();
}

public static IEnumerable<string> ObtainTokens(/*this*/ string originalString)
{
    Regex expression = new Regex(@"{(\w*)}");
    
    foreach (Match element in expression.Matches(originalString))
    {
        //Exclude the brackets from the returned valued
        
        yield return element.Groups[1].Value;
        
    }
}