diff --git a/src/opt/author_name_filter.rs b/src/opt/author_name_filter.rs
index df5292e..b7c168c 100644
--- a/src/opt/author_name_filter.rs
+++ b/src/opt/author_name_filter.rs
@@ -177,4 +177,14 @@ fn test_author_name_filter() {
     )
     .unwrap();
     assert_eq!(l.filter("桃豆こまもち🍡日曜西ま11a"), "桃豆こまもち");
+    let l = AuthorNameFilter::from_json(
+        json::array![{"type": "regex", "rule": "(.*(?=桃豆こまもち))?((?<=桃豆こまもち).*)?"}],
+    )
+    .unwrap();
+    assert_eq!(l.filter("桃豆こまもち🍡日曜西ま11a"), "桃豆こまもち");
+    assert_eq!(
+        l.filter("Some_rubbish@桃豆こまもち🍡日曜西ま11a"),
+        "桃豆こまもち"
+    );
+    assert_eq!(l.filter("Some_rubbish@桃豆こまもち"), "桃豆こまもち");
 }