Fix regular expression for hosting service URLs
Fix regular expression for hosting service URLs

The regex for hosting service URL patterns accidentally had the literal
string character (`r''`) move inside the string. This reverses that
change.

Testing done:
- Ran unit tests.

chipx86/reviewboard,reviewboard/reviewboard,davidt/reviewboard,davidt/reviewboard,davidt/reviewboard,davidt/reviewboard,chipx86/reviewboard,sgallagher/reviewboard,reviewboard/reviewboard,reviewboard/reviewboard,brennie/reviewboard,chipx86/reviewboard,reviewboard/reviewboard,brennie/reviewboard,sgallagher/reviewboard,sgallagher/reviewboard,chipx86/reviewboard,sgallagher/reviewboard,brennie/reviewboard,brennie/reviewboard