diff --git a/nginx_proxy.py b/nginx_proxy.py
index 4a4346c..adb2939 100755
--- a/nginx_proxy.py
+++ b/nginx_proxy.py
@@ -85,7 +85,7 @@ def check_proxy_data_format(var_content):
     :param var_content: content of the proxy data variable
     :return: True if the content is of valid format, False otherwise
     """
-    return re.match(r"^(\w+:[^:,]+,)+\w+:[^:,]+$", var_content) is not None
+    return re.match(r"^(\w+:[^:,]+,)*\w+:[^:,]+$", var_content) is not None
 
 
 def extract_ip(inspect_data):