diff --git a/src/condition-trigger/conditions/conditions/state.ts b/src/condition-trigger/conditions/conditions/state.ts
index 6e1582e1..c50c47c2 100644
--- a/src/condition-trigger/conditions/conditions/state.ts
+++ b/src/condition-trigger/conditions/conditions/state.ts
@@ -7,10 +7,13 @@ import type { ConditionEvaluator, ConditionOfType, EvaluatorContext } from './ty
 // Home Assistant resolves an expected value that names an `input_*` helper to
 // that helper's current state (its Lovelace state-condition behavior), on both
 // the state and the attribute path; only these helper domains are resolved.
-// Regexp directly from:
+// Matches the same entity IDs as the regexp in Home Assistant:
 // https://github.com/home-assistant/core/blob/dev/homeassistant/helpers/condition.py
+// That regexp rejects a trailing `_` with a lookbehind, which Safari before
+// 16.4 fails to parse (taking the whole card down), so the leading and trailing
+// character are spelled out here instead.
 const INPUT_ENTITY_ID =
-  /^input_(?:select|text|number|boolean|datetime)\.(?!.+__)(?!_)[\da-z_]+(?<!_)$/;
+  /^input_(?:select|text|number|boolean|datetime)\.(?!.+__)[\da-z](?:[\da-z_]*[\da-z])?$/;
 
 const isInputHelperName = (value: unknown): value is string =>
   typeof value === 'string' && INPUT_ENTITY_ID.test(value);
diff --git a/tests/condition-trigger/conditions/conditions/state.test.ts b/tests/condition-trigger/conditions/conditions/state.test.ts
index e3217120..c0a82547 100644
--- a/tests/condition-trigger/conditions/conditions/state.test.ts
+++ b/tests/condition-trigger/conditions/conditions/state.test.ts
@@ -734,6 +734,34 @@ describe('state condition', () => {
     ).toBeFalsy();
   });
 
+  it.each([
+    ['input_text.expected', true],
+    ['input_text.a_1', true],
+    ['input_text.', false],
+    ['input_text._expected', false],
+    ['input_text.__expected', false],
+    ['input_text.expected_', false],
+    ['input_text.expected__name', false],
+  ])('should resolve only a valid input helper ID: %s', (entityID, shouldResolve) => {
+    const evaluator = createConditionEvaluator(
+      {
+        condition: 'state' as const,
+        entity_id: 'binary_sensor.foo',
+        state: entityID,
+      },
+      createEvaluatorContext(),
+    );
+
+    expect(
+      evaluator.evaluate({
+        hass: createHASS({
+          'binary_sensor.foo': createStateEntity({ state: 'armed' }),
+          [entityID]: createStateEntity({ state: 'armed' }),
+        }),
+      }).result,
+    ).toBe(shouldResolve);
+  });
+
   it('should not resolve a non-input entity name', () => {
     // Only `input_*` helpers are resolved; other entity names compare literally.
     const evaluator = createConditionEvaluator(