diff --git a/src/common/settings.json b/src/common/settings.json
index 1fbc7879..349c1863 100644
--- a/src/common/settings.json
+++ b/src/common/settings.json
@@ -114,7 +114,7 @@
     "help": "DNS addresses of resolvers to use.",
     "id": "dns-resolvers",
     "label": "DNS resolvers",
-    "regex": "^(?! )( *(((\\b25[0-5]|\\b2[0-4]\\d|\\b[01]?\\d\\d?)(\\.(25[0-5]|2[0-4]\\d|[01]?\\d\\d?)){3})(\\/([1-2][0-9]?|3[0-2]?|[04-9]))?|(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]Z{0,4}){0,4}%[0-9a-zA-Z]+|::(ffff(:0{1,4})?:)?((25[0-5]|(2[0-4]|1?\\d)?\\d)\\.){3}(25[0-5]|(2[0-4]|1?\\d)?\\d)|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1?\\d)?\\d)\\.){3}(25[0-5]|(2[0-4]|1?\\d)?\\d))(\\/(12[0-8]|1[01][0-9]|[0-9][0-9]?))?)(?!.*\\D\\2([^\\d\\/]|$)) *)*$",
+    "regex": "^(?! )(( *[^ ]+)(?!.*\\2))*$",
     "type": "text"
   },
   "DATASTORE_MEMORY_SIZE": {