Update pusher/util.py

Co-authored-by: Evgenii Breikin <[email protected]>

Author: andersonrocha0

pusher/util.py

@@ -11,9 +11,10 @@
 import six
 import sys
 import base64
+SERVER_TO_USER_PREFIX = "#server-to-user-"
 
 channel_name_re = re.compile(r'\A[-a-zA-Z0-9_=@,.;]+\Z')
-server_to_user_channel_re = re.compile(r'\A#server-to-user[-a-zA-Z0-9_=@,.;]+\Z')
+server_to_user_channel_re = re.compile(rf'\A{SERVER_TO_USER_PREFIX}[-a-zA-Z0-9_=@,.;]+\Z')
 app_id_re = re.compile(r'\A[0-9]+\Z')
 pusher_url_re = re.compile(r'\A(http|https)://(.*):(.*)@(.*)/apps/([0-9]+)\Z')
 socket_id_re = re.compile(r'\A\d+\.\d+\Z')