diff --git a/modules/feedadBidAdapter.js b/modules/feedadBidAdapter.js
index b70314c5be4..f180c2782cc 100644
--- a/modules/feedadBidAdapter.js
+++ b/modules/feedadBidAdapter.js
@@ -83,7 +83,7 @@ const TAG = '[FeedAd]';
  * Pattern for valid placement IDs
  * @type {RegExp}
  */
-const PLACEMENT_ID_PATTERN = /^(([a-z0-9])+[-_]?)+$/;
+const PLACEMENT_ID_PATTERN = /^(?:[a-z0-9]+[-_]?)+$/;
 
 const API_ENDPOINT = 'https://api.feedad.com';
 const API_PATH_BID_REQUEST = '/1/prebid/web/bids';