Call extractor pattern via a script

Hi,

I probably missed this part in the tutorials but I really don't find the way how to call an extractor pattern from a script.

Let's define 3 extractor patterns, e_p_1, e_p_2, e_p_3. Now, e_p_1 should call e_p_2 "once if pattern matches" or call e_p_3 "once if no matches".

I thought, the way to achieve this would be calling for each scenario a script that calls the appropriate extractor pattern. How do I do that? The extractor patterns are in the same scrapeable file.

Thank you for your help,

Edgar