diff --git a/Lib/test/re_tests.py b/Lib/test/re_tests.py
index 953e4fd..d6f04f0 100755
--- a/Lib/test/re_tests.py
+++ b/Lib/test/re_tests.py
@@ -646,6 +646,8 @@
     (r'a[^>]*?b', 'a>b', FAIL),
     # bug 490573: minimizing repeat problem
     (r'^a*?$', 'foo', FAIL),
+    # bug 470582: nested groups problem
+    (r'^((a)c)?(ab)$', 'ab', SUCCEED, 'g1+"-"+g2+"-"+g3', 'None-None-ab'),
 ]
 
 try:
diff --git a/Lib/test/test_sre.py b/Lib/test/test_sre.py
index 284212c..6a00aff 100644
--- a/Lib/test/test_sre.py
+++ b/Lib/test/test_sre.py
@@ -78,6 +78,11 @@
 test(r"""sre.match(r'(a)|(b)', 'b').end(1)""", -1)
 test(r"""sre.match(r'(a)|(b)', 'b').span(1)""", (-1, -1))
 
+# bug described in patch 527371
+test(r"""sre.match(r'(a)?a','a').lastindex""", None)
+test(r"""sre.match(r'(a)(b)?b','ab').lastindex""", 1)
+test(r"""sre.match(r'(?P<a>a)(?P<b>b)?b','ab').lastgroup""", 'a')
+
 if verbose:
     print 'Running tests on sre.sub'