Fix show for expressions (parentheses); allow parentheses in input

1 files changed, 1 insertions, 1 deletions

diff --git a/request.php b/request.php
index 2866ada..9dfb4bc 100644
--- a/request.php
+++ b/request.php
@@ -36,7 +36,7 @@ if ($expressions == [])
     die('Not enough expressions requested');
 
 foreach ($expressions as $k => $e)
-    if (preg_match('/[^a-zA-Z\|\&~\-><01 ]/', $e))
+    if (preg_match('/[^a-zA-Z\|\&~\-><01 \(\)]/', $e))
         die('Forbidden character in expression ' . $e);
 
 $expressions = array_map('escapeshellarg', $expressions);