Let's say you want to add a new search engine like ebay. Than you have to perform the following Steps:
You should now have an URL like this one:
The highlighted URL parts the the once that have to be modified before you add it to the program.
You new URL will look like this now:
Basically you have two types of search engines.
These will give you results of external links not belonging to the same domain as the search engine (e.g. google.com). In that case you copy all Links that have nothing to do with the results and make a big mask out of it.
Copy just something from the domains that are irrelevant like:
These will give you internal URLs that will point to sublinks on the same domain (as in this example). Let's copy like 3 URLs from the wanted result links and see what they have in common.
Exchange everything they have not in common with a “*”.
Now you should have an URL like this one: