More regex fixes

Author: h-vetinari

pandas/tests/test_algos.py

@@ -229,9 +229,9 @@ def test_complex_sorting(self):
         # gh 12666 - check no segfault
         x17 = np.array([complex(i) for i in range(17)], dtype=object)
 
-        msg = (r"unorderable types: {0} [<>] {0}".format(r"complex\(\)")
+        msg = ("no ordering relation is defined for complex numbers"
                if _np_version_under1p14 else
-               r"'[<>]' not supported between instances of {0} and {0}".format(
+               "'[<>]' not supported between instances of {0} and {0}".format(
                    "'complex'")
                )
         with pytest.raises(TypeError, match=msg):

pandas/tests/test_sorting.py

@@ -408,11 +408,11 @@ def test_mixed_integer_from_list(self):
     def test_unsortable(self):
         # GH 13714
         arr = np.array([1, 2, datetime.now(), 0, 3], dtype=object)
-        msg = (r"unorderable types: ({0} [<>] {1}|{1} [<>] {0})".format(
-                   r"int\(\)", r"datetime\.datetime\(\)")  # noqa: E126
+        msg = ("can't compare ({0} to {1}|{1} to {0})".format(
+                   "int", r"datetime\.datetime")  # noqa: E126
                if _np_version_under1p14 else
-               (r"'[<>]' not supported between instances of "
-                r"({0} and {1}|{1} and {0})").format(
+               ("'[<>]' not supported between instances of "
+                "({0} and {1}|{1} and {0})").format(
                     "'int'", r"'datetime\.datetime'")
                )
         if compat.PY2: