using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();
t.Text = "a b c a d e a f g a h i";
var ruleA = t.FromTo("a", "[A]");

// Only find and transform the first 3 occurrences of 'a'.
ruleA.StopAfter = 3;

Console.WriteLine(t.Transform());