diff --git a/src/context.rs b/src/context.rs
index f0fdf69..27650a8 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -931,7 +931,18 @@ pub async fn set_values_in_context_one(
 
                             len
                         }
-                        _ => 1,
+                        _ => match &lst0[i + 1] {
+                            Syntax::ValStr(s) if s.len() > 0 => {
+                                let s: Vec<char> = s.chars().collect();
+                                match str1.windows(s.len()).position(|x| x == s) {
+                                    Some(idx) => idx,
+                                    None => {
+                                        return ComparisonResult::Matched(false);
+                                    }
+                                }
+                            }
+                            _ => 1,
+                        },
                     };
 
                     let c: String = str1.drain(0..len).collect();
diff --git a/src/tests/execute.rs b/src/tests/execute.rs
index 97ec476..cdd250b 100644
--- a/src/tests/execute.rs
+++ b/src/tests/execute.rs
@@ -2310,3 +2310,61 @@ async fn test_infinite_match_map() {
         .await
     );
 }
+
+#[tokio::test]
+async fn test_contains_string() {
+    assert_eq!(
+        Ok("\"xy\"".to_string()),
+        parse_to_str(
+            "if let [x:\"test\":y] = \"xtesty\" then x + y else @false",
+            &mut ContextHandler::async_default().await,
+            &mut SystemHandler::default()
+        )
+        .await
+    );
+    assert_eq!(
+        Ok("\"x\"".to_string()),
+        parse_to_str(
+            "if let [x:\"test\":y] = \"xtest\" then x + y else @false",
+            &mut ContextHandler::async_default().await,
+            &mut SystemHandler::default()
+        )
+        .await
+    );
+    assert_eq!(
+        Ok("\"x01y\"".to_string()),
+        parse_to_str(
+            "if let [x:\"test\":y] = \"x0test1y\" then x + y else @false",
+            &mut ContextHandler::async_default().await,
+            &mut SystemHandler::default()
+        )
+        .await
+    );
+    assert_eq!(
+        Ok("(\"x0\", \"1y\")".to_string()),
+        parse_to_str(
+            "if let [x:\"test\":y] = \"x0test1y\" then (x, y) else @false",
+            &mut ContextHandler::async_default().await,
+            &mut SystemHandler::default()
+        )
+        .await
+    );
+    assert_eq!(
+        Ok("@false".to_string()),
+        parse_to_str(
+            "if let [x:\"test\":y] = \"x0tes1y\" then x + y else @false",
+            &mut ContextHandler::async_default().await,
+            &mut SystemHandler::default()
+        )
+        .await
+    );
+    assert_eq!(
+        Ok("((\"x\", \"0\"), \"1y\")".to_string()),
+        parse_to_str(
+            "if let [z:x:\"test\":y] = \"x0test1y\" then (z, x, y) else @false",
+            &mut ContextHandler::async_default().await,
+            &mut SystemHandler::default()
+        )
+        .await
+    );
+}