Optimizer is almost ok. Will go on source generate

StgSharpDebug/TestRegexAnalyse.cs

@@ -38,16 +38,29 @@ namespace StgSharp
     public class TestRegexAnalyse
     {
 
-        private const string regex = @"abc|abd|abe|abf";
+        private static string[] regexSource = [
+            @"http|https",
+            @"abc[0-9]x|abc[0-9]y|abd[0-9]x|abd[0-9]y|xyz",
+            @"get_name|get_value|get_type|set_name|set_value|set_type" 
+];
 
         public static void Run()
         {
-            RegexInterpreter interpreter = RegexInterpreter.Analyze(regex);
-            AbstractSyntaxTree<RegexAstNode, RegexElementLabel> tree = interpreter.Tree;
-            Console.WriteLine();
-            Console.WriteLine();
-            foreach (RegexAstNode node in tree) {
-                Console.WriteLine($"{node.Source.Value}\t{node.Source.Flag}");
+            foreach (string regex in regexSource)
+            {
+                RegexInterpreter interpreter = RegexInterpreter.Analyze(regex);
+                AbstractSyntaxTree<RegexAstNode, RegexElementLabel> tree = interpreter.Tree;
+                Console.WriteLine($"result of \"{regex}\"");
+                TreeEnumerator<RegexAstNode, RegexElementLabel> enumerator = new TreeEnumerator<RegexAstNode, RegexElementLabel>(tree);
+                while (enumerator.MoveNext())
+                {
+                    RegexAstNode node = enumerator.Current;
+                    Console.Write(new string('|', enumerator.Depth));
+                    Console.WriteLine($"\t{node.Source.Value}\t{node.Source.Flag}");
+                }
+                Console.WriteLine();
+                Console.WriteLine();
+                Console.WriteLine();
             }
         }