diff --git a/lib/utils.js b/lib/utils.js
index 84f0511..52e58ec 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -127,7 +127,7 @@ module.exports = {
     reply_to_object: replyToObject,
     print: print,
     err_code: /^([A-Z]+)\s+(.+)$/,
-    monitor_regex: /^[0-9]{10,11}\.[0-9]+ \[[0-9]{1,3} (.(?!\]))+.\]( ".+?")+$/,
+    monitor_regex: /^[0-9]{10,11}\.[0-9]+ \[[0-9]+ .+\]( ".+?")+$/,
     clone: convenienceClone,
     callback_or_emit: callbackOrEmit,
     reply_in_order: replyInOrder