- experimental: added two new attributes to the match object:

"lastgroup" is the name of the last matched capturing group,
  "lastindex" is the index of the same group.  if no group was
  matched, both attributes are set to None.

  the (?P#) feature will be removed in the next relase.

Modules/sre.h

@@ -21,6 +21,7 @@ typedef struct {
     PyObject* code; /* link to the code string object */
     int groups;
     PyObject* groupindex;
+    PyObject* indexgroup;
     /* compatibility */
     PyObject* pattern; /* pattern source (or None) */
     int flags; /* flags used when compiling pattern source */