Stop the topic '*' wildcard from matching across dots (#2568)

TopicExchange documents '*' as any single word, but compiled it to
'.*?[^\.]', whose leading '.*?' also matches dots. Only the final
character was constrained, so 'a.*.c' matched 'a.b.x.c' and every
virtual transport delivered messages to queues that never bound them.

Compile '*' to a single dot-free word instead. '#' is unchanged.

Co-authored-by: Asif Saif Uddin {"Auvi":"অভি"} <auvipy@gmail.com>

Author: chuenchen309

kombu/transport/virtual/exchange.py

@@ -86,7 +86,7 @@ class TopicExchange(ExchangeType):
     type = 'topic'
 
     #: map of wildcard to regex conversions
-    wildcards = {'*': r'.*?[^\.]',
+    wildcards = {'*': r'[^\.]+',
                  '#': r'.*?'}
 
     #: compiled regex cache

t/unit/transport/virtual/test_exchange.py

@@ -84,6 +84,8 @@ def test_prepare_bind(self):
         ('eFoo', 'stock.europe.OSE', None, {'rFoo'}),
         ('eFoo', 'stockxeuropexOSE', None, set()),
         ('eFoo', 'candy.schleckpulver.snap_crackle', None, set()),
+        # '*' is a single word: only 'stock.#' may match a longer key.
+        ('eFoo', 'stock.us.nasdaq.tech', None, {'rFoo'}),
     ])
     def test_lookup(self, exchange, routing_key, default, expected):
         assert self.e.lookup(