--- Lib/sre_compile.py	Mon Sep 22 01:00:01 2008
+++ Lib/sre_compile.py	Mon Sep 22 16:55:45 2008
@@ -320,11 +320,10 @@
                         emit(offset)
             elif op is SUBPATTERN:
                 if av[0]:
-                    group_index = info.group_count
-                    mark_1, mark_2 = group_index * 2, group_index * 2 + 1
+                    mark_1, mark_2 = av[0] * 2 - 2, av[0] * 2 - 1
                     if dir < 0:
                         mark_1, mark_2 = mark_2, mark_1
-                    info.group_count += 1
+                    info.group_count = max(info.group_count, av[0])
                     emit(OPCODES[MARK])
                     emit(mark_1)
                 _compile(code, av[1], flags, info, dir)