Don't match ticket ids embedded in words

Only match ticket ids which are a separate word or are prepended by a
special character to avoid false-positives matches.

plugin.py

@@ -57,6 +57,8 @@ def __init__(self, irc):
         self.__parent = super(wfg, self)
         self.__parent.__init__(irc)
 
+        self.ticket_pattern = re.compile(r"(?:^|\W)#(\d+)")
+
     def doPrivmsg(self, irc, msg):
         channel = msg.args[0]
         payload = msg.args[1]
@@ -65,7 +67,7 @@ def doPrivmsg(self, irc, msg):
         if channels and channel not in channels:
             return
 
-        matchobj = re.search(r'#(\d+)', payload)
+        matchobj = self.ticket_pattern.search(payload)
         if matchobj is None:
             return
 

test.py

@@ -96,4 +96,31 @@ def testPullRequestUrl(self):
             count += 1
             
         self.assertEqual(count, 1)
-# vim:set shiftwidth=4 tabstop=4 expandtab textwidth=79:
+
+    def test_dont_match_in_word(self):
+        obj = self.irc.getCallback('wfg')
+
+        obj.doPrivmsg(
+            self.irc,
+            ircmsgs.privmsg(self.config["supybot.plugins.wfg.channels"][0],
+                            "https://example.tld/foo#1234")
+        )
+        self.assertIsNone(self.irc.takeMsg())
+
+    def test_ticket_id_at_the_beginning(self):
+        obj = self.irc.getCallback('wfg')
+
+        obj.doPrivmsg(
+            self.irc,
+            ircmsgs.privmsg(self.config["supybot.plugins.wfg.channels"][0],
+                            "#1234 should be fine")
+        )
+        msg = self.irc.takeMsg()
+        self.assertIsInstance(msg, ircmsgs.IrcMsg)
+        self.assertEqual(msg.nick, "")
+        self.assertEqual(msg.args[0], self.config["supybot.plugins.wfg.channels"][0])
+        self.assertEqual(msg.args[1],
+                         "#1234 - [PATCH] Read formations from json files – "
+                         "https://gitea.wildfiregames.com/0ad/0ad/issues/1234")
+
+        self.assertIsNone(self.irc.takeMsg())