diff --git a/tool_core.js b/tool_core.js
index 730c25a..2e83320 100644
--- a/tool_core.js
+++ b/tool_core.js
@@ -471,4 +471,8 @@ module.exports = {
     }
     return array
   },
+
+  is_uuid (uuid) {
+    return /^[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}$/i.test(unid)
+  },
 }