using uCalcSoftware;

var uc = new uCalc();
var t = new uCalc.Transformer();
var tokens = t.Tokens;

// Use the parent uCalc instance to define a variable
tokens.uCalc.DefineVariable("replacement = 'REPLACED'");

t.FromTo("original", "{@Eval: replacement}");

Console.WriteLine(t.Transform("Test of original value."));