diff --git a/Lib/sre_compile.py b/Lib/sre_compile.py
index c2996fc..ab2a2cc 100644
--- a/Lib/sre_compile.py
+++ b/Lib/sre_compile.py
@@ -23,9 +23,10 @@
         if op in (LITERAL, NOT_LITERAL):
             if flags & SRE_FLAG_IGNORECASE:
                 emit(OPCODES[OP_IGNORE[op]])
+                emit(_sre.getlower(av, flags))
             else:
                 emit(OPCODES[op])
-            emit(av)
+                emit(av)
         elif op is IN:
             if flags & SRE_FLAG_IGNORECASE:
                 emit(OPCODES[OP_IGNORE[op]])
diff --git a/Lib/test/re_tests.py b/Lib/test/re_tests.py
index 2d3155d..9daf8c4 100755
--- a/Lib/test/re_tests.py
+++ b/Lib/test/re_tests.py
@@ -598,7 +598,7 @@
 
     (r'\xff', '\377', SUCCEED, 'found', chr(255)),
     # new \x semantics
-    (r'\x00ff', '\377', FAIL, 'found', chr(255)),
+    (r'\x00ff', '\377', FAIL),
     # (r'\x00ff', '\377', SUCCEED, 'found', chr(255)),
     (r'\t\n\v\r\f\a\g', '\t\n\v\r\f\ag', SUCCEED, 'found', '\t\n\v\r\f\ag'),
     ('\t\n\v\r\f\a\g', '\t\n\v\r\f\ag', SUCCEED, 'found', '\t\n\v\r\f\ag'),
@@ -610,11 +610,13 @@
 
     # xmllib problem
     (r'(([a-z]+):)?([a-z]+)$', 'smil', SUCCEED, 'g1+"-"+g2+"-"+g3', 'None-None-smil'),
-    # bug 111869 (PRE/PCRE fails on this one, SRE doesn't)
+    # bug 110866: reference to undefined group
+    (r'((.)\1+)', '', SYNTAX_ERROR),
+    # bug 111869: search (PRE/PCRE fails on this one, SRE doesn't)
     (r'.*d', 'abc\nabd', SUCCEED, 'found', 'abd'),
     # bug 112468: various expected syntax errors
-    ('(', '', SYNTAX_ERROR),
-    ('[\\41]', '!', SUCCEED, 'found', '!'),
+    (r'(', '', SYNTAX_ERROR),
+    (r'[\41]', '!', SUCCEED, 'found', '!'),
     # bug 114033: nothing to repeat
     (r'(x?)?', 'x', SUCCEED, 'found', 'x'),
     # bug 115040: rescan if flags are modified inside pattern
@@ -623,5 +625,15 @@
     (r'(?<!abc)(d.f)', 'abcdefdof', SUCCEED, 'found', 'dof'),
     # bug 116251: character class bug
     (r'[\w-]+', 'laser_beam', SUCCEED, 'found', 'laser_beam'),
-
+    # bug 123769+127259: non-greedy backtracking bug
+    (r'.*?\S *:', 'xx:', SUCCEED, 'found', 'xx:'),
+    (r'a[ ]*?\ (\d+).*', 'a   10', SUCCEED, 'found', 'a   10'),
+    (r'a[ ]*?\ (\d+).*', 'a    10', SUCCEED, 'found', 'a    10'),
+    # bug 127259: \Z shouldn't depend on multiline mode
+    (r'(?ms).*?x\s*\Z(.*)','xx\nx\n', SUCCEED, 'g1', ''),
+    # bug 128899: uppercase literals under the ignorecase flag
+    (r'(?i)M+', 'MMM', SUCCEED, 'found', 'MMM'),
+    (r'(?i)m+', 'MMM', SUCCEED, 'found', 'MMM'),
+    (r'(?i)[M]+', 'MMM', SUCCEED, 'found', 'MMM'),
+    (r'(?i)[m]+', 'MMM', SUCCEED, 'found', 'MMM'),
 ]