diff --git a/public/v4/apps/wordpress.yml b/public/v4/apps/wordpress.yml
index 60408b2..dfe7815 100644
--- a/public/v4/apps/wordpress.yml
+++ b/public/v4/apps/wordpress.yml
@@ -32,7 +32,7 @@ caproverOneClickApp:
         - id: $$cap_db_pass
           label: Database password
           description: ''
-          validRegex: /.{1,}/
+          validRegex: /^([a-zA-Z0-9])+$/
         - id: $$cap_wp_version
           label: WordPress Version
           defaultValue: '4.9'