Bad Words in URL

Does this auto apply the regex in the expression?

I.e. if you have the bad word "ass" in your list. Does it need to be "*ass*" or just "ass".

I.e. if it's just "ass" 

1. http://site-badasshole-badurl.com
   
2. http://site-bad-ass-badurl.com
   
3. Both (or does it need to be in format *ass* both both to get rejected?

The string ass will only match if the string is surrounded by none alpha chars (class is not matching here)

But if you add *ass* it is matching even than.