Is Python re thread-safe?

I tried googling but gotten no authoritative answer.

Can someone confirm that the re module http://docs.python.org/2/library/re.html is thread-safe?

More specifically, which functions are and which are not?

Also, can I reuse a single global compiled re object to do sub, search, etc. safely across threads?

Seems like there is still no clear answer?

Ok, a more specific example:

  class MyClass:
     GLOBAL_VAR = re.compile(...)

     def clean(self, value):
        return MyClass.GLOBAL_VAR.sub('', value) 

Will this work as expected when multiple threads call clean at the same time?