diff --git a/application/apps/indexer/processor/src/search/searchers/mod.rs b/application/apps/indexer/processor/src/search/searchers/mod.rs
index a1e0fe5c7..f1339e2e9 100644
--- a/application/apps/indexer/processor/src/search/searchers/mod.rs
+++ b/application/apps/indexer/processor/src/search/searchers/mod.rs
@@ -20,6 +20,8 @@ use uuid::Uuid;
 pub mod linear;
 pub mod regular;
 #[cfg(test)]
+pub mod tests_linear;
+#[cfg(test)]
 pub mod tests_regular;
 #[cfg(test)]
 pub mod tests_values;
diff --git a/application/apps/indexer/processor/src/search/searchers/tests_linear.rs b/application/apps/indexer/processor/src/search/searchers/tests_linear.rs
new file mode 100644
index 000000000..8fd2f5fcb
--- /dev/null
+++ b/application/apps/indexer/processor/src/search/searchers/tests_linear.rs
@@ -0,0 +1,66 @@
+use crate::search::{filter::SearchFilter, searchers::linear::LineSearcher};
+
+#[cfg(test)]
+const SAMPLES: &[&str] = &[
+    "[Info](1.3): a",
+    "[Warn](1.4): b",
+    "[Info](1.5): c",
+    "[Err](1.6): d",
+    "[err](1.6): d",
+    "[Info](1.7): e",
+    "[Info](1.8): f",
+    "[warn](1.4): b",
+];
+
+#[test]
+fn test_linear() -> Result<(), std::io::Error> {
+    let cases: Vec<(SearchFilter, &[usize])> = vec![
+        (
+            SearchFilter::plain(r"[Err]")
+                .regex(false)
+                .ignore_case(true)
+                .word(false),
+            &[3, 4],
+        ),
+        (
+            SearchFilter::plain(r"[err]")
+                .regex(false)
+                .ignore_case(true)
+                .word(false),
+            &[3, 4],
+        ),
+        (
+            SearchFilter::plain(r"[err]")
+                .regex(false)
+                .ignore_case(false)
+                .word(false),
+            &[4],
+        ),
+        (
+            SearchFilter::plain(r"\[Warn\]")
+                .regex(true)
+                .ignore_case(true)
+                .word(false),
+            &[1, 7],
+        ),
+        (
+            SearchFilter::plain(r"warn")
+                .regex(true)
+                .ignore_case(false)
+                .word(false),
+            &[7],
+        ),
+    ];
+    for (filter, matches) in cases.into_iter() {
+        let searcher = LineSearcher::new(&filter)
+            .map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err.to_string()))?;
+        for (n, smpl) in SAMPLES.iter().enumerate() {
+            if searcher.is_match(smpl) {
+                assert!(matches.contains(&n));
+            } else {
+                assert!(!matches.contains(&n));
+            }
+        }
+    }
+    Ok(())
+}