diff --git a/pkg/utils/xstring/string.go b/pkg/utils/xstring/string.go
index 213456c..9c87acf 100644
--- a/pkg/utils/xstring/string.go
+++ b/pkg/utils/xstring/string.go
@@ -30,7 +30,7 @@ import (
 const (
 	_defalutLng  = "en"
 	_lngWildCard = "*"
-	_letters     = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ+-_"
+	_letters     = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
 )
 
 //get locale language