How can I find sites containing certain links with scrapebox?

Ok so i am trying to spy on my competitors....

so lets say all of my competitors are using a link like this on the different pages of their site:

http://www.hello.com/tracking5/purchase

so obviously if i want to be able to find all of my competitors and see what they are doing, i need to be able to use a custom footprint in scrapebox and basically find any sites that contain that link. Any ideas on how to do this? I realize i need to search using a custom footprint, i just dont know what kind. Any help greatly appreciated this has been bugging me for weeks! Thanks