diff --git a/server/api/collections.js b/server/api/collections.js
index 70eec6d1..8c4e2471 100644
--- a/server/api/collections.js
+++ b/server/api/collections.js
@@ -69,7 +69,7 @@ router.post("collections.create", auth(), async (ctx) => {
   if (index) {
     ctx.assertIndexCharacters(
       index,
-      "Index characters must be between x21 to x7E ASCII"
+      "Index characters must be between x20 to x7E ASCII"
     );
   } else {
     index = fractionalIndex(
@@ -664,7 +664,7 @@ router.post("collections.move", auth(), async (ctx) => {
   ctx.assertPresent(index, "index is required");
   ctx.assertIndexCharacters(
     index,
-    "Index characters must be between x21 to x7E ASCII"
+    "Index characters must be between x20 to x7E ASCII"
   );
   ctx.assertUuid(id, "id must be a uuid");
 
diff --git a/shared/i18n/locales/en_US/translation.json b/shared/i18n/locales/en_US/translation.json
index 70f51d4a..22574f02 100644
--- a/shared/i18n/locales/en_US/translation.json
+++ b/shared/i18n/locales/en_US/translation.json
@@ -219,7 +219,6 @@
   "Contents": "Contents",
   "Headings you add to the document will appear here": "Headings you add to the document will appear here",
   "Table of contents": "Table of contents",
-  "Contents": "Contents",
   "By {{ author }}": "By {{ author }}",
   "Are you sure you want to make {{ userName }} an admin? Admins can modify team and billing information.": "Are you sure you want to make {{ userName }} an admin? Admins can modify team and billing information.",
   "Are you sure you want to make {{ userName }} a member?": "Are you sure you want to make {{ userName }} a member?",
diff --git a/shared/utils/indexCharacters.js b/shared/utils/indexCharacters.js
index 62e81047..cff34204 100644
--- a/shared/utils/indexCharacters.js
+++ b/shared/utils/indexCharacters.js
@@ -1,4 +1,4 @@
 // @flow
 
 export const validateIndexCharacters = (index: string) =>
-  /^[\x21-\x7E]+$/i.test(index);
+  new RegExp("^[\x20-\x7E]+$").test(index);