I have a URL in my bibliography which line-breaks in an unpleasant way.
The URL breaks as follows: http://www.mathworks.se/help/matlab/matlab_oop/(break) implementing-operators-for-your-class.html
I want to allow breaks at "-" so that the URL would look something like: http://www.mathworks.se/help/matlab/matlab_oop/implementing-operators-(break) for-your-class.html
I'm using a customized plainnat.bst file in order to get surnames first if that makes some difference.