search valid usernames and hashtags

js/twister_following.js

@@ -367,13 +367,19 @@ function userSearchKeypress(item) {
         // Enter pressed
         var dummy = $('<a></a>');
         if (prefix == '#') { // hashtag
+            partialName = _extractHashtag(partialName);
+            if (partialName) {
                 dummy.attr('href', $.MAL.hashtagUrl(partialName));
                 dummy.text('#' + partialName);
                 openHashtagModal.call(dummy.get(0), item);
+            }
         } else { // username
+            partialName = _extractUsername(partialName);
+            if (partialName) {
                 dummy.attr('href', $.MAL.userUrl(partialName));
                 openProfileModal.call(dummy.get(0), item);
             }
+        }
         return false;
     }