diff --git a/lms/static/coffee/src/discussion/utils.coffee b/lms/static/coffee/src/discussion/utils.coffee
index e822c53a06..34e3b5a716 100644
--- a/lms/static/coffee/src/discussion/utils.coffee
+++ b/lms/static/coffee/src/discussion/utils.coffee
@@ -182,7 +182,7 @@ wmdEditors = {}
   
     codeArchive = []
 
-    RE_DISPLAYMATH = /^([^\$]*?)\$\$([^\$]+?)\$\$(.*)$/m
+    RE_DISPLAYMATH = /^([^\$]*?)\$\$([^\$]*?)\$\$(.*)$/m
     RE_INLINEMATH = /^([^\$]*?)\$([^\$]+?)\$(.*)$/m
 
     ESCAPED_DOLLAR = '@@ESCAPED_D@@'