From 817038563ff5e0251c7c0ce6ddbc8cb65f7a459b Mon Sep 17 00:00:00 2001
From: Raphael Michel <mail@raphaelmichel.de>
Date: Mon, 22 Jan 2018 09:02:57 +0100
Subject: [PATCH] Detect more invalid placeholder specs

---
 src/pretix/base/forms/validators.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/pretix/base/forms/validators.py b/src/pretix/base/forms/validators.py
index d619ed2716..7e4314d678 100644
--- a/src/pretix/base/forms/validators.py
+++ b/src/pretix/base/forms/validators.py
@@ -23,6 +23,12 @@ class PlaceholderValidator(BaseValidator):
                 self.__call__(v)
             return
 
+        if value.count('{') != value.count('}'):
+            raise ValidationError(
+                _('Invalid placeholder syntax: You used a different number of "{" than of "}".'),
+                code='invalid',
+            )
+
         data_placeholders = list(re.findall(r'({[\w\s]*})', value, re.X))
         invalid_placeholders = []
         for placeholder in data_placeholders: