diff --git a/Doc/reference/lexical_analysis.rst b/Doc/reference/lexical_analysis.rst
--- a/Doc/reference/lexical_analysis.rst
+++ b/Doc/reference/lexical_analysis.rst
@@ -401,7 +401,7 @@
 
 .. productionlist::
    stringliteral: [`stringprefix`](`shortstring` | `longstring`)
-   stringprefix: "r" | "u" | "ur" | "R" | "U" | "UR" | "Ur" | "uR"
+   stringprefix: "r" | "u" | "R" | "U" 
    shortstring: "'" `shortstringitem`* "'" | '"' `shortstringitem`* '"'
    longstring: "'''" `longstringitem`* "'''" | '"""' `longstringitem`* '"""'
    shortstringitem: `shortstringchar` | `stringescapeseq`
@@ -447,7 +447,9 @@
 Both string and bytes literals may optionally be prefixed with a letter ``'r'``
 or ``'R'``; such strings are called :dfn:`raw strings` and treat backslashes as
 literal characters.  As a result, in string literals, ``'\U'`` and ``'\u'``
-escapes in raw strings are not treated specially.
+escapes in raw strings are not treated specially. Given that Python 2.x's raw
+unicode literals behave differently than Python 3.x's the ``'ur'`` syntax
+is not supported.
 
    .. versionadded:: 3.3
       The ``'rb'`` prefix of raw bytes literals has been added as a synonym
diff --git a/Lib/test/test_strlit.py b/Lib/test/test_strlit.py
--- a/Lib/test/test_strlit.py
+++ b/Lib/test/test_strlit.py
@@ -123,6 +123,13 @@
         self.assertRaises(SyntaxError, eval, """ rrb'' """)
         self.assertRaises(SyntaxError, eval, """ rbb'' """)
 
+    def test_eval_str_u(self):
+        self.assertEqual(eval(""" u'x' """), 'x')
+        self.assertEqual(eval(""" U'\u00e4' """), 'ä')
+        self.assertEqual(eval(""" u'\N{LATIN SMALL LETTER A WITH DIAERESIS}' """), 'ä')
+        self.assertRaises(SyntaxError, eval, """ ur'' """)
+        self.assertRaises(SyntaxError, eval, """ ru'' """)
+
     def check_encoding(self, encoding, extra=""):
         modname = "xx_" + encoding.replace("-", "_")
         fn = os.path.join(self.tmpdir, modname + ".py")
diff --git a/Misc/HISTORY b/Misc/HISTORY
--- a/Misc/HISTORY
+++ b/Misc/HISTORY
@@ -18,6 +18,9 @@
 Core and Builtins
 -----------------
 
+- Issue #15096: Removed support for ur'' as the raw notation isn't
+  compatible with Python 2.x's raw unicode strings.
+
 - Issue #3996: On Windows, the PyOS_CheckStack function would cause the
   interpreter to abort ("Fatal Python error: Could not reset the stack!")
   instead of throwing a MemoryError.
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -1421,7 +1421,7 @@
                want to support it in arbitrary order like byte literals. */
             else if (!(saw_b || saw_u || saw_r) && (c == 'u' || c == 'U'))
                 saw_u = 1;
-            else if (!saw_r && (c == 'r' || c == 'R'))
+            else if (!(saw_r || saw_u) && (c == 'r' || c == 'R'))
                 saw_r = 1;
             else
                 break;