diff --git a/service/alerting/funcs/function.go b/service/alerting/funcs/function.go
index 881344a8..37978fa9 100644
--- a/service/alerting/funcs/function.go
+++ b/service/alerting/funcs/function.go
@@ -32,5 +32,6 @@ var genericMap = map[string]interface{}{
 	"div": div,
 	"mul": mul,
 	"lookup": lookup,
+	"str_replace": replace,
 	//"get_keystore_secret": getKeystoreSecret,
 }
diff --git a/service/alerting/funcs/strings.go b/service/alerting/funcs/strings.go
new file mode 100644
index 00000000..86a25bbe
--- /dev/null
+++ b/service/alerting/funcs/strings.go
@@ -0,0 +1,20 @@
+/* Copyright © INFINI Ltd. All rights reserved.
+ * web: https://infinilabs.com
+ * mail: hello#infini.ltd */
+
+package funcs
+
+import "strings"
+
+func substring(start, end int, s string) string {
+	runes := []rune(s)
+	length := len(runes)
+	if start < 0 || start > length || end < 0 || end > length{
+		return s
+	}
+	return string(runes[start:end])
+}
+
+func replace(old, new, src string) string {
+	return strings.Replace(src, old, new, -1)
+}
\ No newline at end of file