using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();

t.FromTo("a {txt} c", "<{@Self}>"); // Quoted text treated as 1 token
t.FromTo("x {txt`} z", "<{@Self}>"); // Quotes treated as ordinary chars

Console.WriteLine(t.Transform("a 'b c' b c :: x 'y z' y z"));