diff --git a/pkg/filter/filter.go b/pkg/filter/filter.go
new file mode 100644
index 0000000..f87c9d2
--- /dev/null
+++ b/pkg/filter/filter.go
@@ -0,0 +1,33 @@
+package filter
+
+import (
+	"my/ktgo/pkg/storage"
+	"strings"
+)
+
+func IsListed(lists *[]*storage.Storage, s string) bool {
+	for _, list := range *lists {
+		if isListedInList(list, s) {
+			return true
+		}
+	}
+	return false
+}
+
+func isListedInList(list *storage.Storage, in string) bool {
+	in_low := strings.ToLower(in)
+	for _, b := range *list.GetList() {
+		b = strings.ToLower(b)
+		if strings.Contains(in_low, b) {
+			return true
+		}
+	}
+
+	for _, b := range *list.GetListCase() {
+		if strings.Contains(in, b) {
+			return true
+		}
+	}
+
+	return false
+}