Updates webhooks RegExp to allow undescores, fixes strapi#5543 (strap…

…i#7079)

Signed-off-by: Maxwell Simmer <maxwell.simmer@gmail.com>
Signed-off-by: Gil Fernandes <gil.fernandes@onepointltd.com>

packages/strapi-admin/controllers/Webhooks.js

@@ -12,7 +12,7 @@ const ALLOWED_EVENTS = [
   'media.delete',
 ];
 
-const urlRegex = /^(?:([a-z0-9+.-]+):\/\/)(?:\S+(?::\S*)?@)?(?:(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*\.?)(?::\d{2,5})?(?:[/?#]\S*)?$/;
+const urlRegex = /^(?:([a-z0-9+.-]+):\/\/)(?:\S+(?::\S*)?@)?(?:(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9_]-*)*[a-z\u00a1-\uffff0-9_]+)(?:\.(?:[a-z\u00a1-\uffff0-9_]-*)*[a-z\u00a1-\uffff0-9_]+)*\.?)(?::\d{2,5})?(?:[/?#]\S*)?$/;
 
 const webhookValidator = yup
   .object({