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-rw-r--r--Lib/test/test_re.py10
1 files changed, 10 insertions, 0 deletions
diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
index 07bc63b..c86f502 100644
--- a/Lib/test/test_re.py
+++ b/Lib/test/test_re.py
@@ -235,6 +235,16 @@ class ReTests(unittest.TestCase):
self.assertEqual(re.match('^(?:(a)|c)((?(1)|d))$', 'a').groups(),
('a', ''))
+ # Tests for bug #1177831: exercise groups other than the first group
+ p = re.compile('(?P<g1>a)(?P<g2>b)?((?(g2)c|d))')
+ self.assertEqual(p.match('abc').groups(),
+ ('a', 'b', 'c'))
+ self.assertEqual(p.match('ad').groups(),
+ ('a', None, 'd'))
+ self.assertEqual(p.match('abd'), None)
+ self.assertEqual(p.match('ac'), None)
+
+
def test_re_groupref(self):
self.assertEqual(re.match(r'^(\|)?([^()]+)\1$', '|a|').groups(),
('|', 'a'))