diff --git a/assets/js/helpers/contains.js b/assets/js/helpers/contains.js
new file mode 100644
index 0000000..cd9c53f
--- /dev/null
+++ b/assets/js/helpers/contains.js
@@ -0,0 +1,29 @@
+/**
+ * Creates an array from list using \n as delimiter
+ * and checks if any element in list is contained in the url.
+ *
+ * @param url
+ * @param list
+ * @returns {boolean}
+ */
+function contains(url, list) {
+    var lines = list.split('\n');
+
+    for (var i = 0; i < lines.length; i ++) {
+
+        // Trim all lines from the list one by one
+        var cleanLine = lines[i].trim();
+
+        // If by any chance one line in the list is empty, ignore it
+        if(cleanLine === '') continue;
+
+        // If url contains the current line return true
+        if (url.indexOf(cleanLine) > -1) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+module.exports = contains;