remove old generatoer, use new generator

test/SingleFile/regex.cs

@@ -164,5 +164,21 @@ static void MatchCountAnyGroup(ReadOnlySpan<char> seq)
 
     int ptr = 0;
     
-    
+    int group_start = ptr;
+    int furthest = -1;
+    do
+    {
+        if((furthest = seq.LastIndexOf("123"))>0)
+        {
+            ptr += furthest + 3;
+            break;
+        }
+    } while(true);
+    // grouping
+    if(furthest >= 0)
+    {
+        ptr = furthest;
+        int group_end = ptr;
+        // group "name" matched from group_start to group_end
+    }
 }

test/StgSharpDebug/TestRegexAnalyse.cs

@@ -21,8 +21,8 @@ namespace StgSharp
     {
 
         private static string[] regexSource = [
-            @"(?<name>.*)234",
-            /*
+            @"12(1234|(012.*34)|9125)34",
+            /**/
             @"http|https|ftp|ftps",
             @"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",