Allow a regular expression for filtering.

src/zope/testrunner/options.py

@@ -250,6 +250,9 @@
     dest='ignore_new_threads',
     help="""\
 If a thread with this name is left behind, don't report this at the end.
+This is a case-sensitive regular expression, used in match mode.
+This option can be used multiple times. If a thread name matches any of them,
+it will be ignored.
 """)
 
 

src/zope/testrunner/runner.py

@@ -851,10 +851,10 @@ def stopTest(self, test):
         # Did the test leave any new threads behind?
         new_threads = []
         for t in threading.enumerate():
-            if t.isAlive():
-                if t not in self._threads:
-                    if t.name not in self.options.ignore_new_threads:
-                        new_threads.append(t)
+            if t.isAlive() and t not in self._threads:
+                if not any([re.match(p, t.name)
+                            for p in self.options.ignore_new_threads]):
+                    new_threads.append(t)
 
         if new_threads:
             self.options.output.test_threads(test, new_threads)