diff --git a/js/lib/urlutil.js b/js/lib/urlutil.js
index 6ce75c045f3..8419ca6b473 100644
--- a/js/lib/urlutil.js
+++ b/js/lib/urlutil.js
@@ -108,7 +108,7 @@ const UrlUtil = {
     // for cases, pure string
     const case3Reg = /[\?\.\/\s:]/
     // for cases, data:uri, view-source:uri and about
-    const case4Reg = /^data|view-source|mailto|about|chrome-extension:.*/
+    const case4Reg = /^data:|view-source:|mailto:|about:|chrome-extension:.*/
 
     let str = input.trim()
     let scheme = this.getScheme(str)