diff --git a/openupgrade_scripts/scripts/base/19.0.1.3/pre-migration.py b/openupgrade_scripts/scripts/base/19.0.1.3/pre-migration.py
index 39b145615b4b..7a86655a677d 100644
--- a/openupgrade_scripts/scripts/base/19.0.1.3/pre-migration.py
+++ b/openupgrade_scripts/scripts/base/19.0.1.3/pre-migration.py
@@ -176,3 +176,41 @@ def migrate(env, version):
     openupgrade.rename_xmlids(env.cr, _renamed_xmlids)
     openupgrade.rename_xmlids(env.cr, _merged_xmlids, allow_merge=True)
     openupgrade.rename_fields(env, _renamed_fields)
+    _strip_removed_search_view_attrs(env)
+
+
+def _strip_removed_search_view_attrs(env):
+    """Strip 19.0 RNG-removed attrs (`expand=` on <group>/<field>,
+    `string="Group By"` on <group>) from stored search-view arch_db.
+    """
+    openupgrade.logged_query(
+        env.cr,
+        r"""
+        UPDATE ir_ui_view v
+           SET arch_db = sub.new_arch
+          FROM (
+            SELECT id,
+                   jsonb_object_agg(
+                       lang,
+                       to_jsonb(
+                           regexp_replace(
+                               regexp_replace(content,
+                                   '(<(?:group|field)[^>]*?)\s+expand="[^"]*"',
+                                   '\1', 'g'),
+                               '(<group[^>]*?)\s+string="Group By"',
+                               '\1', 'g'
+                           )
+                       )
+                   ) AS new_arch
+              FROM (
+                SELECT v2.id, je.key AS lang, je.value #>> '{}' AS content
+                  FROM ir_ui_view v2, jsonb_each(v2.arch_db) je
+                 WHERE v2.type='search'
+                   AND (v2.arch_db::text LIKE '%%expand=%%'
+                        OR v2.arch_db::text LIKE '%%string="Group By"%%')
+              ) flat
+             GROUP BY id
+          ) sub
+         WHERE v.id = sub.id
+        """,
+    )
diff --git a/openupgrade_scripts/scripts/base/tests/data_base_migration.py b/openupgrade_scripts/scripts/base/tests/data_base_migration.py
index 472065b36553..6c5278073116 100644
--- a/openupgrade_scripts/scripts/base/tests/data_base_migration.py
+++ b/openupgrade_scripts/scripts/base/tests/data_base_migration.py
@@ -41,4 +41,42 @@
         ],
     }
 )
+
+# Search-view fixtures for the 19.0 RNG attribute strip helper.
+# `expand=` on <group>/<field> and `string="Group By"` on <group>
+# were valid in 18.0 but rejected by 19.0's stricter RelaxNG schema.
+env["ir.ui.view"].create(
+    {
+        "name": "test search group_expand",
+        "model": "res.partner",
+        "type": "search",
+        "arch": """
+            <search>
+                <field name="name"/>
+                <group expand="0" string="Group By">
+                    <filter
+                        string="Country"
+                        name="country"
+                        context="{'group_by': 'country_id'}"
+                    />
+                </group>
+            </search>
+        """,
+    }
+)
+env["ir.ui.view"].create(
+    {
+        "name": "test search field_expand",
+        "model": "res.partner",
+        "type": "search",
+        "arch": """
+            <search>
+                <field name="name"/>
+                <searchpanel>
+                    <field name="country_id" expand="1" select="multi"/>
+                </searchpanel>
+            </search>
+        """,
+    }
+)
 env.cr.commit()
diff --git a/openupgrade_scripts/scripts/base/tests/test_base_migration.py b/openupgrade_scripts/scripts/base/tests/test_base_migration.py
index 525218394f51..80a67cc9909d 100644
--- a/openupgrade_scripts/scripts/base/tests/test_base_migration.py
+++ b/openupgrade_scripts/scripts/base/tests/test_base_migration.py
@@ -24,3 +24,41 @@ def test_server_action_child_ids(self):
             action2.child_ids.mapped("name"),
             ("child action 1", "child action 2", "child action 3"),
         )
+
+    def test_strip_removed_search_view_attrs(self):
+        """19.0 RNG-removed attrs (`expand=` on <group>/<field>,
+        `string="Group By"` on <group>) are stripped from arch_db
+        on search views; legitimate attrs are preserved.
+        """
+        view_group = self.env["ir.ui.view"].search(
+            [("name", "=", "test search group_expand")]
+        )
+        self.assertTrue(view_group)
+        arch_group = view_group.arch_db
+        self.assertNotIn(
+            'expand="0"',
+            arch_group,
+            "expand= should be stripped from <group> in search arch",
+        )
+        self.assertNotIn(
+            'string="Group By"',
+            arch_group,
+            'string="Group By" should be stripped from <group>',
+        )
+        # Legit attrs preserved
+        self.assertIn('name="country"', arch_group)
+        self.assertIn('string="Country"', arch_group)
+
+        view_field = self.env["ir.ui.view"].search(
+            [("name", "=", "test search field_expand")]
+        )
+        self.assertTrue(view_field)
+        arch_field = view_field.arch_db
+        self.assertNotIn(
+            'expand="1"',
+            arch_field,
+            "expand= should be stripped from <field> in searchpanel",
+        )
+        # Legit attrs preserved
+        self.assertIn('select="multi"', arch_field)
+        self.assertIn('name="country_id"', arch_field)