diff --git a/app/assets/javascripts/pretty-text/engines/discourse-markdown/mentions.js b/app/assets/javascripts/pretty-text/engines/discourse-markdown/mentions.js
index a9a7015bc5f..c71563bab71 100644
--- a/app/assets/javascripts/pretty-text/engines/discourse-markdown/mentions.js
+++ b/app/assets/javascripts/pretty-text/engines/discourse-markdown/mentions.js
@@ -33,7 +33,7 @@ export function setup(helper) {
   });
 }
 
-function mentionRegex(unicodeUsernames) {
+export function mentionRegex(unicodeUsernames) {
   if (unicodeUsernames) {
     try {
       // Create the regex from a string, because Babel doesn't understand