Very good, I recently noticed that almost all pictures hosted by one of my members on photobucket.com had been deleted... I had to delete a large number of his threads and posts.
Here is the regex I added for photobucket.com:
Code:
/(http?:\/\/)?(img\.)?photobucket\.com\/[a-zA-Z0-9-_\.\\\/]+/
Possible Improvement: I think that the error message that is displayed should be phrased, so that it is displayed in the member's language.