diff --git a/backend/src/plugins/Tags/TagsPlugin.ts b/backend/src/plugins/Tags/TagsPlugin.ts
index f6aa89e1..49977288 100644
--- a/backend/src/plugins/Tags/TagsPlugin.ts
+++ b/backend/src/plugins/Tags/TagsPlugin.ts
@@ -203,7 +203,7 @@ export const TagsPlugin = zeppelinGuildPlugin<TagsPluginType>()("tags", {
           return "";
         }
 
-        if (input.match(/^<(?:@(?:!|&)?|#)\d+>$/)) {
+        if (input.match(/^<(?:@[!&]?|#)\d+>$/)) {
           return input;
         }
 
@@ -217,6 +217,14 @@ export const TagsPlugin = zeppelinGuildPlugin<TagsPluginType>()("tags", {
 
         return "";
       },
+
+      isMention: input => {
+        if (typeof input !== "string") {
+          return "";
+        }
+
+        return input.match(/^<(?:@[!&]?|#)\d+>$/);
+      },
     };
 
     for (const [name, fn] of Object.entries(state.tagFunctions)) {