Update assertRaisesRegexp -> assertRaisesRegex

The old spelling is deprecated but was being kept around to support
Python 2.

test_fakeredis.py

@@ -398,7 +398,7 @@ def test_incrbyfloat_expiry(self):
 
     def test_incrbyfloat_bad_type(self):
         self.redis.set('foo', 'bar')
-        with self.assertRaisesRegexp(redis.ResponseError, 'not a valid float'):
+        with self.assertRaisesRegex(redis.ResponseError, 'not a valid float'):
             self.redis.incrbyfloat('foo', 1.0)
         self.redis.rpush('foo2', 1)
         with self.assertRaises(redis.ResponseError):
@@ -532,7 +532,7 @@ def test_mget_with_no_keys(self):
         if REDIS3:
             self.assertEqual(self.redis.mget([]), [])
         else:
-            with self.assertRaisesRegexp(
+            with self.assertRaisesRegex(
                     redis.ResponseError, 'wrong number of arguments'):
                 self.redis.mget([])
 
@@ -582,7 +582,7 @@ def test_setex_using_timedelta(self):
         self.assertEqual(self.redis.get('foo'), b'bar')
 
     def test_setex_using_float(self):
-        self.assertRaisesRegexp(
+        self.assertRaisesRegex(
             redis.ResponseError, 'integer', self.redis.setex, 'foo', 1.2,
             'bar')
 
@@ -3749,7 +3749,7 @@ def test_pexpireat_should_return_false_for_missing_key(self):
 
     def test_expire_should_not_handle_floating_point_values(self):
         self.redis.set('foo', 'bar')
-        with self.assertRaisesRegexp(
+        with self.assertRaisesRegex(
                 redis.ResponseError, 'value is not an integer or out of range'):
             self.redis.expire('something_new', 1.2)
             self.redis.pexpire('something_new', 1000.2)
@@ -4287,7 +4287,7 @@ def test_pttl_should_return_value_for_expiring_key(self):
 
     def test_expire_should_not_handle_floating_point_values(self):
         self.redis.set('foo', 'bar')
-        with self.assertRaisesRegexp(
+        with self.assertRaisesRegex(
                 redis.ResponseError, 'value is not an integer or out of range'):
             self.redis.expire('something_new', 1.2)
             self.redis.pexpire('something_new', 1000.2)