diff --git a/src/filters/naive_filter/filter.rs b/src/filters/naive_filter/filter.rs
index 110cf3a..4280645 100644
--- a/src/filters/naive_filter/filter.rs
+++ b/src/filters/naive_filter/filter.rs
@@ -161,4 +161,52 @@ mod tests {
         assert_eq!(17, passed_messages);
         assert_eq!(83, filtered_messages);
     }
+
+    #[test]
+    fn invalid_filters() {
+        assert!(
+            NaiveFilter::from_filters(&vec!["method~='get]".to_string()]).is_err(),
+            "The filter should not have been created"
+        );
+        assert!(
+            NaiveFilter::from_filters(&vec!["method~='get']".to_string()]).is_err(),
+            "The filter should not have been created"
+        );
+        assert!(
+            NaiveFilter::from_filters(&vec!["status~=`404".to_string()]).is_err(),
+            "The filter should not have been created"
+        );
+        assert!(
+            NaiveFilter::from_filters(&vec!["status~=`404,123`".to_string()]).is_err(),
+            "The filter should not have been created"
+        );
+        assert!(
+            NaiveFilter::from_filters(&vec!["status~=`abc`".to_string()]).is_err(),
+            "The filter should not have been created"
+        );
+        assert!(
+            NaiveFilter::from_filters(&vec!["status~=`abc`".to_string()]).is_err(),
+            "The filter should not have been created"
+        );
+    }
+
+    #[test]
+    fn valid_filters() {
+        assert!(
+            NaiveFilter::from_filters(&vec!["method=='get'".to_string()]).is_ok(),
+            "The filter should have been created"
+        );
+        assert!(
+            NaiveFilter::from_filters(&vec!["status==`404`".to_string()]).is_ok(),
+            "The filter should have been created"
+        );
+        assert!(
+            NaiveFilter::from_filters(&vec!["status==internal.status".to_string()]).is_ok(),
+            "The filter should have been created"
+        );
+        assert!(
+            NaiveFilter::from_filters(&vec!["internal.value!=`3.1415962`".to_string()]).is_ok(),
+            "The filter should not have been created"
+        );
+    }
 }
diff --git a/src/filters/naive_filter/operand.rs b/src/filters/naive_filter/operand.rs
index e362e42..799b876 100644
--- a/src/filters/naive_filter/operand.rs
+++ b/src/filters/naive_filter/operand.rs
@@ -28,6 +28,7 @@ impl NaiveFilterOperand {
     }
 
     pub(crate) fn from_str(operand_str: &str) -> Result<Self, NaiveFilterError> {
+        let operand_str = operand_str.trim();
         match operand_str.chars().next() {
             // number
             Some('`') => {