diff --git a/app/assets/javascripts/posts.js b/app/assets/javascripts/posts.js
index 2dbdd4d9e..26721de52 100644
--- a/app/assets/javascripts/posts.js
+++ b/app/assets/javascripts/posts.js
@@ -71,11 +71,14 @@
         }
 
         var term = before_caret_text.match(/\S+/g).pop();
-        var prefixes = /^(?:-|~|general:|gen:|artist:|art:|copyright:|copy:|co:|character:|char:|ch:)(.+)$/
+        var prefixes = /^(?:-|~|general:|gen:|artist:|art:|copyright:|copy:|co:|character:|char:|ch:)(.*)$/
         var match = term.match(prefixes);
         if (match) {
           term = match[1];
         }
+        if (term === "") {
+          return;
+        }
 
         $.ajax({
           url: "/tags.json",