using uCalcSoftware;

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

t.FromTo("a test", "'{@Self}' is part of: '{@Doc}'");

// Note: .Str(0) here is a shortcut for .Matches().Str(0)
Console.WriteLine(t.Transform("This sentence is just a test").Str(0));