diff --git a/lib/common.lib.php b/lib/common.lib.php
index 5462666ac..ee1c927d0 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -2684,7 +2684,7 @@ function get_search_string($stx)
     $stx_pattern[] = '#\.*/+#';
     $stx_pattern[] = '#\\\*#';
     $stx_pattern[] = '#\.{2,}#';
-    $stx_pattern[] = '#[/\'\"%=*\#\(\)\|\+\-\&\!\$@~\{\}\[\]`]+#';
+    $stx_pattern[] = '#[/\'\"%=*\#\(\)\|\+\-\&\!\$@~\{\}\[\]`;:\?]+#';
 
     $stx_replace = array();
     $stx_replace[] = '';