diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff633c5a1f..3da995d06d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@
 - Fix: 月の違う同じ日はセパレータが表示されないのを修正
 - Fix: 縦横比が極端なカスタム絵文字を表示する際にレイアウトが崩れる箇所があるのを修正  
   (Cherry-picked from https://github.com/MisskeyIO/misskey/pull/725)
+- Fix: ERROR CODE: APP_IMPORT on iOS <= 16.3 (SyntaxError: Invalid regular expression: invalid group specifier name)
 
 ### Server
 - Fix: アンテナの書き込み時にキーワードが与えられなかった場合のエラーをApiErrorとして投げるように
diff --git a/packages/misskey-js/src/nyaize.ts b/packages/misskey-js/src/nyaize.ts
index 729fea8fc3..e346f5505a 100644
--- a/packages/misskey-js/src/nyaize.ts
+++ b/packages/misskey-js/src/nyaize.ts
@@ -3,9 +3,6 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-const enRegex1 = /(?<=n)a/gi;
-const enRegex2 = /(?<=morn)ing/gi;
-const enRegex3 = /(?<=every)one/gi;
 const koRegex1 = /[나-낳]/g;
 const koRegex2 = /(다$)|(다(?=\.))|(다(?= ))|(다(?=!))|(다(?=\?))/gm;
 const koRegex3 = /(야(?=\?))|(야$)|(야(?= ))/gm;
@@ -15,9 +12,12 @@ export function nyaize(text: string): string {
 		// ja-JP
 		.replaceAll('な', 'にゃ').replaceAll('ナ', 'ニャ').replaceAll('ﾅ', 'ﾆｬ')
 		// en-US
-		.replace(enRegex1, x => x === 'A' ? 'YA' : 'ya')
-		.replace(enRegex2, x => x === 'ING' ? 'YAN' : 'yan')
-		.replace(enRegex3, x => x === 'ONE' ? 'NYAN' : 'nyan')
+		.replaceAll('na', 'nya')
+		.replaceAll('NA', 'NYA')
+		.replaceAll('morning', 'mornyan')
+		.replaceAll('MORNING', 'MORNYAN')
+		.replaceAll('everyone', 'everynyan')
+		.replaceAll('EVERYONE', 'EVERYNYAN')
 		// ko-KR
 		.replace(koRegex1, match => !isNaN(match.charCodeAt(0)) ? String.fromCharCode(
 			match.charCodeAt(0) + '냐'.charCodeAt(0) - '나'.charCodeAt(0),