Issue #1700, reported by Nguyen Quan Son, fix by Fredruk Lundh:

Regular Expression inline flags not handled correctly for some unicode
characters.  (Forward port from 2.5.2.)

3 files changed, 34 insertions, 1 deletions

diff --git a/Lib/sre_compile.py b/Lib/sre_compile.py
index 7109599..22ab2fd 100644
--- a/Lib/sre_compile.py
+++ b/Lib/sre_compile.py
@@ -525,7 +525,7 @@ def compile(p, flags=0):
         indexgroup[i] = k
 
     return _sre.compile(
-        pattern, flags, code,
+        pattern, flags | p.pattern.flags, code,
         p.pattern.groups-1,
         groupindex, indexgroup
         )
diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
index f1fdfba..3056ef3 100644
--- a/Lib/test/test_re.py
+++ b/Lib/test/test_re.py
@@ -642,6 +642,36 @@ class ReTests(unittest.TestCase):
             self.assertEqual(re.compile("bla").match(a), None)
             self.assertEqual(re.compile("").match(a).groups(), ())
 
+    def test_inline_flags(self):
+        # Bug #1700
+        upper_char = unichr(0x1ea0) # Latin Capital Letter A with Dot Bellow
+        lower_char = unichr(0x1ea1) # Latin Small Letter A with Dot Bellow
+
+        p = re.compile(upper_char, re.I | re.U)
+        q = p.match(lower_char)
+        self.assertNotEqual(q, None)
+
+        p = re.compile(lower_char, re.I | re.U)
+        q = p.match(upper_char)
+        self.assertNotEqual(q, None)
+
+        p = re.compile('(?i)' + upper_char, re.U)
+        q = p.match(lower_char)
+        self.assertNotEqual(q, None)
+
+        p = re.compile('(?i)' + lower_char, re.U)
+        q = p.match(upper_char)
+        self.assertNotEqual(q, None)
+
+        p = re.compile('(?iu)' + upper_char)
+        q = p.match(lower_char)
+        self.assertNotEqual(q, None)
+
+        p = re.compile('(?iu)' + lower_char)
+        q = p.match(upper_char)
+        self.assertNotEqual(q, None)
+
+
 def run_re_tests():
     from test.re_tests import benchmarks, tests, SUCCEED, FAIL, SYNTAX_ERROR
     if verbose:
diff --git a/Misc/NEWS b/Misc/NEWS
index 50fecb7..3e3f074 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -348,6 +348,9 @@ Core and builtins
 Library
 -------
 
+- Issue #1700: Regular expression inline flags incorrectly handle certain
+  unicode characters.
+
 - Issue #1689: PEP 3141, numeric abstract base classes.
 
 - Tk issue #1851526: Return results from Python callbacks to Tcl as