Exclude URLs not working properly?

[gavin19]

I want to match all URLs on from Reddit so I just used

.*reddit\.com*

That was the most simple match I could come up with. Matching any page
on Reddit.com. Except I want to exclude any URL that contains
'reddit.com/tb/'. So I used

.*reddit\.com/tb/.*

The regex is legitimate, I tested it in RegexBuddy and it matches any
URL containing 'reddit.com/tb/'. Except when I add it to 'Exclude
URLs' it doesn't work.

Can anyone provide a 'proper' regex that will exclude URLs which
contain 'reddit.com/tb/' or even just '/tb/'? I have tried multiple
combinations and none work.

Thank you in advance.