From a0e8acc9485276fd1f24028fc1d15b96acb0f8d7 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 18:53:02 -0700
Subject: [PATCH 01/14] test_assert_series_equal.py

---
 pandas/tests/util/test_assert_series_equal.py | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/pandas/tests/util/test_assert_series_equal.py b/pandas/tests/util/test_assert_series_equal.py
index ae4523014b01d..6bf461d849b5e 100644
--- a/pandas/tests/util/test_assert_series_equal.py
+++ b/pandas/tests/util/test_assert_series_equal.py
@@ -292,9 +292,22 @@ def test_series_equal_exact_for_nonnumeric():
     tm.assert_series_equal(s1, s2, check_exact=True)
     tm.assert_series_equal(s2, s1, check_exact=True)
 
-    with pytest.raises(AssertionError):
+    msg = """Series are different
+
+Series values are different \\(100\\.0 %\\)
+\\[index\\]: \\[0, 1\\]
+\\[left\\]:  \\[a, b\\]
+\\[right\\]: \\[b, a\\]"""
+    with pytest.raises(AssertionError, match=msg):
         tm.assert_series_equal(s1, s3, check_exact=True)
-    with pytest.raises(AssertionError):
+
+    msg = """Series are different
+
+Series values are different \\(100\\.0 %\\)
+\\[index\\]: \\[0, 1\\]
+\\[left\\]:  \\[b, a\\]
+\\[right\\]: \\[a, b\\]"""
+    with pytest.raises(AssertionError, match=msg):
         tm.assert_series_equal(s3, s1, check_exact=True)
 
 

From f840032edcaa85d9cb510bc585b74e2734ef3322 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 19:54:59 -0700
Subject: [PATCH 02/14] test_setitem_slice_mismatch_length_raises

---
 pandas/tests/extension/base/setitem.py | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/pandas/tests/extension/base/setitem.py b/pandas/tests/extension/base/setitem.py
index a4e6fc0f78cbb..6df6acccb56c6 100644
--- a/pandas/tests/extension/base/setitem.py
+++ b/pandas/tests/extension/base/setitem.py
@@ -282,8 +282,23 @@ def test_setitem_loc_iloc_slice(self, data):
         self.assert_equal(result, expected)
 
     def test_setitem_slice_mismatch_length_raises(self, data):
+        # This class is a test mixin class, based on which test class it's mixed with the expected error messages can
+        # vary. This regular expression catches all the variants of those messages. It's formatted as a big OR
+        # statement: /m1|m2|m3|m4/
+
+        msg = (
+            # pandas.core.arrays.period.PeriodArray
+            # pandas.core.arrays.datetimes.DatetimeArray
+            "(cannot set using a slice indexer with a different length than the value)" "|"
+            # string_arrow.ArrowStringArray
+            "(Length of indexer and values mismatch)" "|"
+            # pandas.tests.extension.decimal.array.DecimalArray
+            "(cannot copy sequence with size \\d to array axis with dimension \\d)" "|"
+            # All the rest
+            "(could not broadcast input array from shape \\(\\d\\) into shape \\(\\d\\))"
+        )
         arr = data[:5]
-        with pytest.raises(ValueError):
+        with pytest.raises(ValueError, match=msg):
             arr[:1] = arr[:2]
 
     def test_setitem_slice_array(self, data):

From 8c1c26d833635abd7898b97622e7173a3f9ad9d3 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 20:02:05 -0700
Subject: [PATCH 03/14] test_setitem_scalar_key_sequence_raise

---
 pandas/tests/extension/base/setitem.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/pandas/tests/extension/base/setitem.py b/pandas/tests/extension/base/setitem.py
index 6df6acccb56c6..f3560c37ab17e 100644
--- a/pandas/tests/extension/base/setitem.py
+++ b/pandas/tests/extension/base/setitem.py
@@ -307,8 +307,17 @@ def test_setitem_slice_array(self, data):
         self.assert_extension_array_equal(arr, data[-5:])
 
     def test_setitem_scalar_key_sequence_raise(self, data):
+        # Check the comment on test_setitem_slice_mismatch_length_raises for more info.
+        msg = (
+            # pandas.core.arrays.string_arrow.ArrowStringArray
+            "(Must pass scalars with scalar indexer)" "|"
+            # pandas.core.arrays.datetimes.DatetimeArray
+            "(Could not convert object to NumPy datetime)" "|"
+            # All the rest
+            "(setting an array element with a sequence)"
+        )
         arr = data[:5].copy()
-        with pytest.raises(ValueError):
+        with pytest.raises(ValueError, match=msg):
             arr[0] = arr[[0, 1]]
 
     def test_setitem_preserves_views(self, data):

From 0fa645177e0dfd87739ec7b6623b2cd2bed485c2 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 20:13:03 -0700
Subject: [PATCH 04/14] test_sub

---
 pandas/tests/arrays/boolean/test_arithmetic.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pandas/tests/arrays/boolean/test_arithmetic.py b/pandas/tests/arrays/boolean/test_arithmetic.py
index 01de64568a011..aec6023392e50 100644
--- a/pandas/tests/arrays/boolean/test_arithmetic.py
+++ b/pandas/tests/arrays/boolean/test_arithmetic.py
@@ -46,7 +46,8 @@ def test_add_mul(left_array, right_array, opname, exp):
 
 
 def test_sub(left_array, right_array):
-    with pytest.raises(TypeError):
+    msg = "the `-` operator, is not supported, use the bitwise_xor, the `\\^` operator, or the logical_xor"
+    with pytest.raises(TypeError, match=msg):
         # numpy points to ^ operator or logical_xor function instead
         left_array - right_array
 

From 712b479adcfd5ad894a50c30029c73c33eecbd00 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 20:22:14 -0700
Subject: [PATCH 05/14] test_arithmetic

---
 .../tests/arrays/boolean/test_arithmetic.py   | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/pandas/tests/arrays/boolean/test_arithmetic.py b/pandas/tests/arrays/boolean/test_arithmetic.py
index aec6023392e50..e77ff42ae76c6 100644
--- a/pandas/tests/arrays/boolean/test_arithmetic.py
+++ b/pandas/tests/arrays/boolean/test_arithmetic.py
@@ -93,13 +93,26 @@ def test_error_invalid_values(data, all_arithmetic_operators):
     ops = getattr(s, op)
 
     # invalid scalars
-    with pytest.raises(TypeError):
+    msg = (
+        "(ufunc '\\w+' did not contain a loop with signature matching types)" "|"
+        "(ufunc '\\w+' not supported for the input types, and the inputs could "
+        "not be safely coerced to any supported types)" "|"
+        "(\\w+ cannot perform the operation \\w+)"
+    )
+    with pytest.raises(TypeError, match=msg):
         ops("foo")
-    with pytest.raises(TypeError):
+
+    msg = "unsupported operand type\\(s\\) for"
+    with pytest.raises(TypeError, match=msg):
         ops(pd.Timestamp("20180101"))
 
     # invalid array-likes
     if op not in ("__mul__", "__rmul__"):
         # TODO(extension) numpy's mul with object array sees booleans as numbers
-        with pytest.raises(TypeError):
+        msg = (
+            "(unsupported operand type\\(s\\) for)" "|"
+            "(can only concatenate str \\(not \"bool\"\\) to str)" "|"
+            "(not all arguments converted during string formatting)" "|"
+        )
+        with pytest.raises(TypeError, match=msg):
             ops(pd.Series("foo", index=s.index))

From 1ecbdf134a251b1e2a11f99402bb0f9c3ad5c809 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 20:23:38 -0700
Subject: [PATCH 06/14] black pandas on test_arithmetic.py

---
 pandas/tests/arrays/boolean/test_arithmetic.py | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/pandas/tests/arrays/boolean/test_arithmetic.py b/pandas/tests/arrays/boolean/test_arithmetic.py
index e77ff42ae76c6..3dbc3f6a7dd8d 100644
--- a/pandas/tests/arrays/boolean/test_arithmetic.py
+++ b/pandas/tests/arrays/boolean/test_arithmetic.py
@@ -94,9 +94,9 @@ def test_error_invalid_values(data, all_arithmetic_operators):
 
     # invalid scalars
     msg = (
-        "(ufunc '\\w+' did not contain a loop with signature matching types)" "|"
+        "(ufunc '\\w+' did not contain a loop with signature matching types)|"
         "(ufunc '\\w+' not supported for the input types, and the inputs could "
-        "not be safely coerced to any supported types)" "|"
+        "not be safely coerced to any supported types)|"
         "(\\w+ cannot perform the operation \\w+)"
     )
     with pytest.raises(TypeError, match=msg):
@@ -110,9 +110,9 @@ def test_error_invalid_values(data, all_arithmetic_operators):
     if op not in ("__mul__", "__rmul__"):
         # TODO(extension) numpy's mul with object array sees booleans as numbers
         msg = (
-            "(unsupported operand type\\(s\\) for)" "|"
-            "(can only concatenate str \\(not \"bool\"\\) to str)" "|"
-            "(not all arguments converted during string formatting)" "|"
+            "(unsupported operand type\\(s\\) for)|"
+            '(can only concatenate str \\(not "bool"\\) to str)|'
+            "(not all arguments converted during string formatting)"
         )
         with pytest.raises(TypeError, match=msg):
             ops(pd.Series("foo", index=s.index))

From 99f1a4f73e3cef9c0b47e2ce7ed9e6af2d8001e3 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 20:25:43 -0700
Subject: [PATCH 07/14] black pandas on setitem.py

---
 pandas/tests/extension/base/setitem.py | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/pandas/tests/extension/base/setitem.py b/pandas/tests/extension/base/setitem.py
index f3560c37ab17e..46f3562cf37ee 100644
--- a/pandas/tests/extension/base/setitem.py
+++ b/pandas/tests/extension/base/setitem.py
@@ -289,11 +289,11 @@ def test_setitem_slice_mismatch_length_raises(self, data):
         msg = (
             # pandas.core.arrays.period.PeriodArray
             # pandas.core.arrays.datetimes.DatetimeArray
-            "(cannot set using a slice indexer with a different length than the value)" "|"
+            "(cannot set using a slice indexer with a different length than the value)|"
             # string_arrow.ArrowStringArray
-            "(Length of indexer and values mismatch)" "|"
+            "(Length of indexer and values mismatch)|"
             # pandas.tests.extension.decimal.array.DecimalArray
-            "(cannot copy sequence with size \\d to array axis with dimension \\d)" "|"
+            "(cannot copy sequence with size \\d to array axis with dimension \\d)|"
             # All the rest
             "(could not broadcast input array from shape \\(\\d\\) into shape \\(\\d\\))"
         )
@@ -310,9 +310,9 @@ def test_setitem_scalar_key_sequence_raise(self, data):
         # Check the comment on test_setitem_slice_mismatch_length_raises for more info.
         msg = (
             # pandas.core.arrays.string_arrow.ArrowStringArray
-            "(Must pass scalars with scalar indexer)" "|"
+            "(Must pass scalars with scalar indexer)|"
             # pandas.core.arrays.datetimes.DatetimeArray
-            "(Could not convert object to NumPy datetime)" "|"
+            "(Could not convert object to NumPy datetime)|"
             # All the rest
             "(setting an array element with a sequence)"
         )

From 669b4273936240babe606bd9bf68504687000e71 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 21:00:29 -0700
Subject: [PATCH 08/14] BaseComparisonOpsTests

---
 pandas/tests/extension/base/ops.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pandas/tests/extension/base/ops.py b/pandas/tests/extension/base/ops.py
index c93603398977e..4259a37ab2fb2 100644
--- a/pandas/tests/extension/base/ops.py
+++ b/pandas/tests/extension/base/ops.py
@@ -145,7 +145,8 @@ def _compare_other(self, s, data, op_name, other):
 
             # series
             s = pd.Series(data)
-            with pytest.raises(TypeError):
+            msg = "not supported between instances of '[\\w.]+' and '[\\w.]+'"
+            with pytest.raises(TypeError, match=msg):
                 op(s, other)
 
     def test_compare_scalar(self, data, all_compare_operators):

From ded71026ba9966cdce25e6b182bbc70e1e33bf4a Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 21:35:04 -0700
Subject: [PATCH 09/14] extension/base/ops.py

---
 pandas/tests/extension/base/ops.py | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/pandas/tests/extension/base/ops.py b/pandas/tests/extension/base/ops.py
index 4259a37ab2fb2..6a1ed1924d850 100644
--- a/pandas/tests/extension/base/ops.py
+++ b/pandas/tests/extension/base/ops.py
@@ -30,7 +30,16 @@ def _check_op(self, s, op, other, op_name, exc=NotImplementedError):
                 expected = s.combine(other, op)
                 self.assert_series_equal(result, expected)
         else:
-            with pytest.raises(exc):
+            msg = (
+                "(unsupported operand type\\(s\\) for)|"
+                "(cannot perform [\\w_]+ with this index type: [\\w_]+)|"
+                "(Object with dtype category cannot perform the numpy op [\\w_]+)|"
+                "(cannot add [\\w_]+ and [\\w_]+)|"
+                "(can't multiply sequence by non-int of type '[\\w_]+')|"
+                '(can only concatenate str \\(not "[\\w_]+"\\) to str)|'
+                "(Object with dtype category cannot perform the numpy op [\\w_]+)"
+            )
+            with pytest.raises(exc, match=msg):
                 op(s, other)
 
     def _check_divmod_op(self, s, op, other, exc=Exception):
@@ -44,7 +53,12 @@ def _check_divmod_op(self, s, op, other, exc=Exception):
             self.assert_series_equal(result_div, expected_div)
             self.assert_series_equal(result_mod, expected_mod)
         else:
-            with pytest.raises(exc):
+            msg = (
+                "('tuple' object has no attribute 'dtype')|"
+                "(cannot perform __r?divmod__ with this index type)|"
+                "(unsupported operand type\\(s\\) for divmod\\(\\))"
+            )
+            with pytest.raises(exc, match=msg):
                 divmod(s, other)
 
 
@@ -111,7 +125,8 @@ def test_add_series_with_extension_array(self, data):
     def test_error(self, data, all_arithmetic_operators):
         # invalid ops
         op_name = all_arithmetic_operators
-        with pytest.raises(AttributeError):
+        msg = "'\\w+' object has no attribute '[\\w_]+'"
+        with pytest.raises(AttributeError, match=msg):
             getattr(data, op_name)
 
     @pytest.mark.parametrize("box", [pd.Series, pd.DataFrame])

From 798753cba1368f77df956855e82f5bf75b534882 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 21:46:55 -0700
Subject: [PATCH 10/14] Break too long lines

---
 pandas/tests/arrays/boolean/test_arithmetic.py | 3 ++-
 pandas/tests/extension/base/setitem.py         | 8 +++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/pandas/tests/arrays/boolean/test_arithmetic.py b/pandas/tests/arrays/boolean/test_arithmetic.py
index 3dbc3f6a7dd8d..2bb2a02df9a7c 100644
--- a/pandas/tests/arrays/boolean/test_arithmetic.py
+++ b/pandas/tests/arrays/boolean/test_arithmetic.py
@@ -46,7 +46,8 @@ def test_add_mul(left_array, right_array, opname, exp):
 
 
 def test_sub(left_array, right_array):
-    msg = "the `-` operator, is not supported, use the bitwise_xor, the `\\^` operator, or the logical_xor"
+    msg = "the `-` operator, is not supported, use the bitwise_xor, " \
+          "the `\\^` operator, or the logical_xor"
     with pytest.raises(TypeError, match=msg):
         # numpy points to ^ operator or logical_xor function instead
         left_array - right_array
diff --git a/pandas/tests/extension/base/setitem.py b/pandas/tests/extension/base/setitem.py
index 46f3562cf37ee..266a145cc572b 100644
--- a/pandas/tests/extension/base/setitem.py
+++ b/pandas/tests/extension/base/setitem.py
@@ -282,8 +282,9 @@ def test_setitem_loc_iloc_slice(self, data):
         self.assert_equal(result, expected)
 
     def test_setitem_slice_mismatch_length_raises(self, data):
-        # This class is a test mixin class, based on which test class it's mixed with the expected error messages can
-        # vary. This regular expression catches all the variants of those messages. It's formatted as a big OR
+        # This class is a test mixin class, based on which test class it's mixed
+        # with the expected error messages can vary. This regular expression
+        # catches all the variants of those messages. It's formatted as a big OR
         # statement: /m1|m2|m3|m4/
 
         msg = (
@@ -295,7 +296,8 @@ def test_setitem_slice_mismatch_length_raises(self, data):
             # pandas.tests.extension.decimal.array.DecimalArray
             "(cannot copy sequence with size \\d to array axis with dimension \\d)|"
             # All the rest
-            "(could not broadcast input array from shape \\(\\d\\) into shape \\(\\d\\))"
+            "(could not broadcast input array from "
+            "shape \\(\\d\\) into shape \\(\\d\\))"
         )
         arr = data[:5]
         with pytest.raises(ValueError, match=msg):

From dde76de715000c20610e4c4b461e03724eacf522 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 21:52:23 -0700
Subject: [PATCH 11/14] The numpy error was an external one

---
 pandas/tests/arrays/boolean/test_arithmetic.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/pandas/tests/arrays/boolean/test_arithmetic.py b/pandas/tests/arrays/boolean/test_arithmetic.py
index 2bb2a02df9a7c..560d63026b98e 100644
--- a/pandas/tests/arrays/boolean/test_arithmetic.py
+++ b/pandas/tests/arrays/boolean/test_arithmetic.py
@@ -46,9 +46,7 @@ def test_add_mul(left_array, right_array, opname, exp):
 
 
 def test_sub(left_array, right_array):
-    msg = "the `-` operator, is not supported, use the bitwise_xor, " \
-          "the `\\^` operator, or the logical_xor"
-    with pytest.raises(TypeError, match=msg):
+    with tm.external_error_raised(TypeError):
         # numpy points to ^ operator or logical_xor function instead
         left_array - right_array
 

From ddb14ee743aff6bdc261995aef5a13144fc0113e Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 23:03:40 -0700
Subject: [PATCH 12/14] Update RegExs to match more tests

---
 pandas/tests/arrays/boolean/test_arithmetic.py | 5 ++++-
 pandas/tests/extension/base/setitem.py         | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/pandas/tests/arrays/boolean/test_arithmetic.py b/pandas/tests/arrays/boolean/test_arithmetic.py
index 560d63026b98e..36474f786ad00 100644
--- a/pandas/tests/arrays/boolean/test_arithmetic.py
+++ b/pandas/tests/arrays/boolean/test_arithmetic.py
@@ -101,7 +101,10 @@ def test_error_invalid_values(data, all_arithmetic_operators):
     with pytest.raises(TypeError, match=msg):
         ops("foo")
 
-    msg = "unsupported operand type\\(s\\) for"
+    msg = (
+        "(unsupported operand type\\(s\\) for)|"
+        "(Concatenation operation is not implemented for NumPy arrays)"
+    )
     with pytest.raises(TypeError, match=msg):
         ops(pd.Timestamp("20180101"))
 
diff --git a/pandas/tests/extension/base/setitem.py b/pandas/tests/extension/base/setitem.py
index 266a145cc572b..7e470692f9d71 100644
--- a/pandas/tests/extension/base/setitem.py
+++ b/pandas/tests/extension/base/setitem.py
@@ -297,7 +297,7 @@ def test_setitem_slice_mismatch_length_raises(self, data):
             "(cannot copy sequence with size \\d to array axis with dimension \\d)|"
             # All the rest
             "(could not broadcast input array from "
-            "shape \\(\\d\\) into shape \\(\\d\\))"
+            "shape \\(\\d,?\\) into shape \\(\\d,?\\))"
         )
         arr = data[:5]
         with pytest.raises(ValueError, match=msg):

From e2ec45555a9922d06caa5836eb02f878bf83eff9 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Fri, 18 Dec 2020 23:51:49 -0700
Subject: [PATCH 13/14] Added new error messages

---
 pandas/tests/extension/base/ops.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pandas/tests/extension/base/ops.py b/pandas/tests/extension/base/ops.py
index 6a1ed1924d850..94ea30b5c7d07 100644
--- a/pandas/tests/extension/base/ops.py
+++ b/pandas/tests/extension/base/ops.py
@@ -37,7 +37,8 @@ def _check_op(self, s, op, other, op_name, exc=NotImplementedError):
                 "(cannot add [\\w_]+ and [\\w_]+)|"
                 "(can't multiply sequence by non-int of type '[\\w_]+')|"
                 '(can only concatenate str \\(not "[\\w_]+"\\) to str)|'
-                "(Object with dtype category cannot perform the numpy op [\\w_]+)"
+                "(Object with dtype category cannot perform the numpy op [\\w_]+)|"
+                "(Concatenation operation is not implemented for NumPy arrays)"
             )
             with pytest.raises(exc, match=msg):
                 op(s, other)

From 50b05ef6016671b5c13ae76385c150dbc5b9aba5 Mon Sep 17 00:00:00 2001
From: Mohammad Jafar Mashhadi <raindigital2007@gmail.com>
Date: Sat, 19 Dec 2020 09:22:34 -0700
Subject: [PATCH 14/14] Removed redundant parenthesis in regexps

---
 .../tests/arrays/boolean/test_arithmetic.py   | 18 ++++++-------
 pandas/tests/extension/base/ops.py            | 26 +++++++++----------
 pandas/tests/extension/base/setitem.py        | 16 ++++++------
 3 files changed, 30 insertions(+), 30 deletions(-)

diff --git a/pandas/tests/arrays/boolean/test_arithmetic.py b/pandas/tests/arrays/boolean/test_arithmetic.py
index 36474f786ad00..72b378f75c936 100644
--- a/pandas/tests/arrays/boolean/test_arithmetic.py
+++ b/pandas/tests/arrays/boolean/test_arithmetic.py
@@ -93,17 +93,17 @@ def test_error_invalid_values(data, all_arithmetic_operators):
 
     # invalid scalars
     msg = (
-        "(ufunc '\\w+' did not contain a loop with signature matching types)|"
-        "(ufunc '\\w+' not supported for the input types, and the inputs could "
-        "not be safely coerced to any supported types)|"
-        "(\\w+ cannot perform the operation \\w+)"
+        "ufunc '\\w+' did not contain a loop with signature matching types|"
+        "ufunc '\\w+' not supported for the input types, and the inputs could "
+        "not be safely coerced to any supported types|"
+        "\\w+ cannot perform the operation \\w+"
     )
     with pytest.raises(TypeError, match=msg):
         ops("foo")
 
     msg = (
-        "(unsupported operand type\\(s\\) for)|"
-        "(Concatenation operation is not implemented for NumPy arrays)"
+        "unsupported operand type\\(s\\) for|"
+        "Concatenation operation is not implemented for NumPy arrays"
     )
     with pytest.raises(TypeError, match=msg):
         ops(pd.Timestamp("20180101"))
@@ -112,9 +112,9 @@ def test_error_invalid_values(data, all_arithmetic_operators):
     if op not in ("__mul__", "__rmul__"):
         # TODO(extension) numpy's mul with object array sees booleans as numbers
         msg = (
-            "(unsupported operand type\\(s\\) for)|"
-            '(can only concatenate str \\(not "bool"\\) to str)|'
-            "(not all arguments converted during string formatting)"
+            "unsupported operand type\\(s\\) for|"
+            'can only concatenate str \\(not "bool"\\) to str|'
+            "not all arguments converted during string formatting"
         )
         with pytest.raises(TypeError, match=msg):
             ops(pd.Series("foo", index=s.index))
diff --git a/pandas/tests/extension/base/ops.py b/pandas/tests/extension/base/ops.py
index 94ea30b5c7d07..6e65418bde58d 100644
--- a/pandas/tests/extension/base/ops.py
+++ b/pandas/tests/extension/base/ops.py
@@ -31,14 +31,14 @@ def _check_op(self, s, op, other, op_name, exc=NotImplementedError):
                 self.assert_series_equal(result, expected)
         else:
             msg = (
-                "(unsupported operand type\\(s\\) for)|"
-                "(cannot perform [\\w_]+ with this index type: [\\w_]+)|"
-                "(Object with dtype category cannot perform the numpy op [\\w_]+)|"
-                "(cannot add [\\w_]+ and [\\w_]+)|"
-                "(can't multiply sequence by non-int of type '[\\w_]+')|"
-                '(can only concatenate str \\(not "[\\w_]+"\\) to str)|'
-                "(Object with dtype category cannot perform the numpy op [\\w_]+)|"
-                "(Concatenation operation is not implemented for NumPy arrays)"
+                "unsupported operand type\\(s\\) for|"
+                "cannot perform [\\w_]+ with this index type: [\\w_]+|"
+                "Object with dtype category cannot perform the numpy op [\\w_]+|"
+                "cannot add [\\w_]+ and [\\w_]+|"
+                "can't multiply sequence by non-int of type '[\\w_]+'|"
+                'can only concatenate str \\(not "[\\w_]+"\\) to str|'
+                "Object with dtype category cannot perform the numpy op [\\w_]+|"
+                "Concatenation operation is not implemented for NumPy arrays"
             )
             with pytest.raises(exc, match=msg):
                 op(s, other)
@@ -55,9 +55,9 @@ def _check_divmod_op(self, s, op, other, exc=Exception):
             self.assert_series_equal(result_mod, expected_mod)
         else:
             msg = (
-                "('tuple' object has no attribute 'dtype')|"
-                "(cannot perform __r?divmod__ with this index type)|"
-                "(unsupported operand type\\(s\\) for divmod\\(\\))"
+                "'tuple' object has no attribute 'dtype'|"
+                "cannot perform __r?divmod__ with this index type|"
+                "unsupported operand type\\(s\\) for divmod\\(\\)"
             )
             with pytest.raises(exc, match=msg):
                 divmod(s, other)
@@ -126,7 +126,7 @@ def test_add_series_with_extension_array(self, data):
     def test_error(self, data, all_arithmetic_operators):
         # invalid ops
         op_name = all_arithmetic_operators
-        msg = "'\\w+' object has no attribute '[\\w_]+'"
+        msg = "'[\\w_]+' object has no attribute '[\\w_]+'"
         with pytest.raises(AttributeError, match=msg):
             getattr(data, op_name)
 
@@ -161,7 +161,7 @@ def _compare_other(self, s, data, op_name, other):
 
             # series
             s = pd.Series(data)
-            msg = "not supported between instances of '[\\w.]+' and '[\\w.]+'"
+            msg = "not supported between instances of '[\\w._]+' and '[\\w._]+'"
             with pytest.raises(TypeError, match=msg):
                 op(s, other)
 
diff --git a/pandas/tests/extension/base/setitem.py b/pandas/tests/extension/base/setitem.py
index 7e470692f9d71..e77d2b2633e88 100644
--- a/pandas/tests/extension/base/setitem.py
+++ b/pandas/tests/extension/base/setitem.py
@@ -290,14 +290,14 @@ def test_setitem_slice_mismatch_length_raises(self, data):
         msg = (
             # pandas.core.arrays.period.PeriodArray
             # pandas.core.arrays.datetimes.DatetimeArray
-            "(cannot set using a slice indexer with a different length than the value)|"
+            "cannot set using a slice indexer with a different length than the value|"
             # string_arrow.ArrowStringArray
-            "(Length of indexer and values mismatch)|"
+            "Length of indexer and values mismatch|"
             # pandas.tests.extension.decimal.array.DecimalArray
-            "(cannot copy sequence with size \\d to array axis with dimension \\d)|"
+            "cannot copy sequence with size \\d to array axis with dimension \\d|"
             # All the rest
-            "(could not broadcast input array from "
-            "shape \\(\\d,?\\) into shape \\(\\d,?\\))"
+            "could not broadcast input array from "
+            "shape \\(\\d,?\\) into shape \\(\\d,?\\)"
         )
         arr = data[:5]
         with pytest.raises(ValueError, match=msg):
@@ -312,11 +312,11 @@ def test_setitem_scalar_key_sequence_raise(self, data):
         # Check the comment on test_setitem_slice_mismatch_length_raises for more info.
         msg = (
             # pandas.core.arrays.string_arrow.ArrowStringArray
-            "(Must pass scalars with scalar indexer)|"
+            "Must pass scalars with scalar indexer|"
             # pandas.core.arrays.datetimes.DatetimeArray
-            "(Could not convert object to NumPy datetime)|"
+            "Could not convert object to NumPy datetime|"
             # All the rest
-            "(setting an array element with a sequence)"
+            "setting an array element with a sequence"
         )
         arr = data[:5].copy()
         with pytest.raises(ValueError, match=msg):