diff --git a/danmu_api/utils/auto-match-mapping-util.js b/danmu_api/utils/auto-match-mapping-util.js
index ad35f10..c45b5ca 100644
--- a/danmu_api/utils/auto-match-mapping-util.js
+++ b/danmu_api/utils/auto-match-mapping-util.js
@@ -1,7 +1,16 @@
+const NON_RULE_TITLE_CHARACTERS = (() => {
+  try {
+    return new RegExp('[^\\p{L}\\p{N}]', 'gu');
+  } catch {
+    // nodejs-mobile builds without Unicode property escapes still need CJK title matching.
+    return /[^0-9A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u052F\u05D0-\u05EA\u05EF-\u05F2\u0620-\u063F\u0640-\u064A\u0660-\u0669\u0671-\u06D3\u06D5\u06EE-\u06FC\u06FF\u1100-\u11FF\u3005-\u3007\u3031-\u3035\u3038-\u303B\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312F\u3131-\u318E\u31A0-\u31BF\u31F0-\u31FF\u3400-\u4DBF\u4E00-\u9FFF\uA960-\uA97F\uAC00-\uD7A3\uD7B0-\uD7FF\uF900-\uFAFF]/g;
+  }
+})();
+
 function normalizeRuleTitle(value) {
   return String(value || '')
     .normalize('NFKC')
-    .replace(/[^\p{L}\p{N}]/gu, '')
+    .replace(NON_RULE_TITLE_CHARACTERS, '')
     .toLowerCase();
 }
 
diff --git a/danmu_api/worker.test.js b/danmu_api/worker.test.js
index 8a95089..78c3851 100644
--- a/danmu_api/worker.test.js
+++ b/danmu_api/worker.test.js
@@ -297,6 +297,25 @@ test('worker.js API endpoints', async (t) => {
   });
 
   await t.test('auto match mapping table', async t => {
+    await t.test('falls back when Unicode property escapes are unavailable', async () => {
+      const NativeRegExp = globalThis.RegExp;
+      globalThis.RegExp = function (pattern, flags) {
+        if (String(pattern).includes('\\p{')) throw new SyntaxError('Unicode property escapes are unavailable');
+        return new NativeRegExp(pattern, flags);
+      };
+
+      try {
+        const compat = await import('./utils/auto-match-mapping-util.js?unicode-properties=unavailable');
+        const { rules, warnings } = compat.parseAutoMatchMappingRules('進撃の巨人 S01E01->ＳＰＹ×ＦＡＭＩＬＹ S01E03');
+
+        assert.deepEqual(warnings, []);
+        assert.equal(compat.resolveAutoMatchMapping(rules, { title: '進撃の 巨人！', season: 1, episode: 2 }).targetEpisode, 4);
+        assert.equal(compat.candidateMatchesMappingTitle({ animeTitle: 'SPY FAMILY' }, rules[0]), true);
+      } finally {
+        globalThis.RegExp = NativeRegExp;
+      }
+    });
+
     await t.test('parses and resolves open, bounded, qualified, and platform rules', () => {
       const { rules, warnings } = parseAutoMatchMappingRules([
         '永生 S05E02->永生 S01E58',