diff --git a/packages/backend-rs/src/misc/check_word_mute.rs b/packages/backend-rs/src/misc/check_word_mute.rs
index d9d1006dfe..0faf946c8d 100644
--- a/packages/backend-rs/src/misc/check_word_mute.rs
+++ b/packages/backend-rs/src/misc/check_word_mute.rs
@@ -78,11 +78,11 @@ mod unit_test {
             "😇".to_string(),
         ];
 
-        let hiragana_1 = r#"/[\u{3040}-\u{309f}]/u"#.to_string();
-        let hiragana_2 = r#"/[あ-ん]/u"#.to_string();
-        let katakana_1 = r#"/[\u{30a1}-\u{30ff}]/u"#.to_string();
-        let katakana_2 = r#"/[ア-ン]/u"#.to_string();
-        let emoji = r#"/[\u{1f300}-\u{1f5ff}\u{1f900}-\u{1f9ff}\u{1f600}-\u{1f64f}\u{1f680}-\u{1f6ff}\u{2600}-\u{26ff}\u{2700}-\u{27bf}\u{1f1e6}-\u{1f1ff}\u{1f191}-\u{1f251}\u{1f004}\u{1f0cf}\u{1f170}-\u{1f171}\u{1f17e}-\u{1f17f}\u{1f18e}\u{3030}\u{2b50}\u{2b55}\u{2934}-\u{2935}\u{2b05}-\u{2b07}\u{2b1b}-\u{2b1c}\u{3297}\u{3299}\u{303d}\u{00a9}\u{00ae}\u{2122}\u{23f3}\u{24c2}\u{23e9}-\u{23ef}\u{25b6}\u{23f8}-\u{23fa}]/u"#.to_string();
+        let hiragana_1 = r"/[\u{3040}-\u{309f}]/u".to_string();
+        let hiragana_2 = r"/[あ-ん]/u".to_string();
+        let katakana_1 = r"/[\u{30a1}-\u{30ff}]/u".to_string();
+        let katakana_2 = r"/[ア-ン]/u".to_string();
+        let emoji = r"/[\u{1f300}-\u{1f5ff}\u{1f900}-\u{1f9ff}\u{1f600}-\u{1f64f}\u{1f680}-\u{1f6ff}\u{2600}-\u{26ff}\u{2700}-\u{27bf}\u{1f1e6}-\u{1f1ff}\u{1f191}-\u{1f251}\u{1f004}\u{1f0cf}\u{1f170}-\u{1f171}\u{1f17e}-\u{1f17f}\u{1f18e}\u{3030}\u{2b50}\u{2b55}\u{2934}-\u{2935}\u{2b05}-\u{2b07}\u{2b1b}-\u{2b1c}\u{3297}\u{3299}\u{303d}\u{00a9}\u{00ae}\u{2122}\u{23f3}\u{24c2}\u{23e9}-\u{23ef}\u{25b6}\u{23f8}-\u{23fa}]/u".to_string();
 
         assert!(check_word_mute_impl(&texts, &[], &["/the/i".to_string()]));