- 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.

Lib/sre_parse.py

@@ -515,6 +515,8 @@ def _parse(source, state):
                     group = state.getgroup(name)
                 while 1:
                     p = _parse(source, state)
+                    if group is not None:
+                        p.append((INDEX, group))
                     if source.match(")"):
                         if b:
                             b.append(p)