Added a comment about the emoticon regex

src/gajim.py

@@ -1062,6 +1062,8 @@ class Interface:
 		basic_pattern = links + mail + formatting
 		self.basic_pattern_re = sre.compile(basic_pattern, sre.IGNORECASE)
 		
+		# When an emoticon is bordered by an alpha-numeric character it is NOT
+		# expanded.  e.g., foo:) NO, foo :) YES, (brb) NO, (:)) YES, etc.
 		emoticons_pattern = '(?<!\w)(?:'
 		# sort keys by length so :qwe emot is checked before :q
 		keys = self.emoticons.keys()