diff --git a/client/src/components/Tags/model.js b/client/src/components/Tags/model.js
index ced4f9896553..43dbc05d74ee 100644
--- a/client/src/components/Tags/model.js
+++ b/client/src/components/Tags/model.js
@@ -7,7 +7,7 @@ import { keyedColorScheme } from "utils/color";
 
 // Valid tag regex. The basic format here is a tag name with optional subtags
 // separated by a period, and then an optional value after a colon.
-export const VALID_TAG_RE = /^([^\s.:])+(.[^\s.:]+)*(:[^\s.:]+)?$/;
+export const VALID_TAG_RE = /^([^\s.:])+(\.[^\s.:]+)*(:\S+)?$/;
 
 export class TagModel {
     /**