fix regex

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

apps/comments/js/commentstabview.js

@@ -264,7 +264,7 @@
 
 				// replace every mention either at the start of the input or after a whitespace
 				// followed by a non-word character.
-				message = message.replace(new RegExp("(^|\\s)(" + mention + ")(\\b|?![_-@.])", 'g'),
+				message = message.replace(new RegExp("(^|\\s)(" + mention + ")\\b", 'g'),
 					function(match, p1) {
 						// to  get number of whitespaces (0 vs 1) right
 						return p1+displayName;