Fix regular expression for finding bug numbers in comments, and add tests

--HG--
branch : 1.0

treeherder/perfalert/perfalert/analyze_talos.py

@@ -124,7 +124,7 @@ def bugs_from_comments(comments):
         bXXXXX
     """
     retval = []
-    m = re.search("b(?:ug(?:s)?)?\s*((?:\d+[, ]*)+)", comments, re.I)
+    m = re.search(r"\bb(?:ug(?:s)?)?\s*((?:\d+[, ]*)+)", comments, re.I)
     if m:
         for m in re.findall("\d+", m.group(1)):
             retval.append(int(m))

treeherder/perfalert/perfalert/test_regexp.py

@@ -0,0 +1,8 @@
+from analyze_talos import bugs_from_comments
+
+assert bugs_from_comments("Bug 12345") == [12345]
+assert bugs_from_comments("bug12345") == [12345]
+assert bugs_from_comments("b12345") == [12345]
+assert bugs_from_comments("Bugs 12345, 67890") == [12345, 67890]
+assert bugs_from_comments("Fix instanceof with bound functions (bug 597167, r=brendan).") == [597167]
+assert bugs_from_comments("Backed out changeset f8854fb6b63f - Wrong patch attached to the bug.") == []