diff --git a/awx/ui_next/src/screens/Inventory/shared/InventorySourceSubForms/SharedFields.jsx b/awx/ui_next/src/screens/Inventory/shared/InventorySourceSubForms/SharedFields.jsx
index 8150a9a45f..35e2c3fc30 100644
--- a/awx/ui_next/src/screens/Inventory/shared/InventorySourceSubForms/SharedFields.jsx
+++ b/awx/ui_next/src/screens/Inventory/shared/InventorySourceSubForms/SharedFields.jsx
@@ -3,7 +3,7 @@ import { withI18n } from '@lingui/react';
 import { t } from '@lingui/macro';
 import { useField } from 'formik';
 import { FormGroup } from '@patternfly/react-core';
-import { minMaxValue } from '../../../../util/validators';
+import { minMaxValue, regExp } from '../../../../util/validators';
 import AnsibleSelect from '../../../../components/AnsibleSelect';
 import { VariablesField } from '../../../../components/CodeMirrorInput';
 import FormField, {
@@ -192,6 +192,7 @@ export const HostFilterField = withI18n()(({ i18n }) => {
       )}
       name="host_filter"
       type="text"
+      validate={regExp(i18n)}
     />
   );
 });
diff --git a/awx/ui_next/src/util/validators.jsx b/awx/ui_next/src/util/validators.jsx
index ee97cd4702..035b4dfb56 100644
--- a/awx/ui_next/src/util/validators.jsx
+++ b/awx/ui_next/src/util/validators.jsx
@@ -88,3 +88,14 @@ export function combine(validators) {
     return undefined;
   };
 }
+
+export function regExp(i18n) {
+  return value => {
+    try {
+      RegExp(value);
+    } catch {
+      return i18n._(t`This field must be a regular expression`);
+    }
+    return undefined;
+  };
+}
diff --git a/awx/ui_next/src/util/validators.test.js b/awx/ui_next/src/util/validators.test.js
index f3e37c6cde..11b1a3bfd9 100644
--- a/awx/ui_next/src/util/validators.test.js
+++ b/awx/ui_next/src/util/validators.test.js
@@ -5,6 +5,7 @@ import {
   noWhiteSpace,
   integer,
   combine,
+  regExp,
 } from './validators';
 
 const i18n = { _: val => val };
@@ -128,4 +129,13 @@ describe('validators', () => {
     });
     expect(combine(validators)('ok')).toBeUndefined();
   });
+
+  test('regExp rejects invalid regular expression', () => {
+    expect(regExp(i18n)('[')).toEqual({
+      id: 'This field must be a regular expression',
+    });
+    expect(regExp(i18n)('')).toBeUndefined();
+    expect(regExp(i18n)('ok')).toBeUndefined();
+    expect(regExp(i18n)('[^a-zA-Z]')).toBeUndefined();
+  });
 });