one generic rule to rule them all?

Hi all,
First of all, is there a document somewhere that describes what each rule can do and how it can be used? If there is, please share!
And now, the question... Is there a way to set a number of triggers that could then be used as a single trigger for other rules?
What I mean is this:
Dates are always formatted in different ways
2016-06-02
02-06-2016
06-02-2016
06-02-16
... and that's just the dashes.
Is there a way to create a generic find_date rule that could then be used as a trigger in a new rule? Or maybe it could just add a comment to a file with the date found and allow the next rule to use that comment to add the date to a renamed file.
In short, do I really have to recreate a date search pattern or other common search pattern each time? If that's the case, it's fine. I just don't want to find out later I did all that repetitive work for nada.
Thanks for your help.
-eco
First of all, is there a document somewhere that describes what each rule can do and how it can be used? If there is, please share!

And now, the question... Is there a way to set a number of triggers that could then be used as a single trigger for other rules?
What I mean is this:
Dates are always formatted in different ways
2016-06-02
02-06-2016
06-02-2016
06-02-16
... and that's just the dashes.
Is there a way to create a generic find_date rule that could then be used as a trigger in a new rule? Or maybe it could just add a comment to a file with the date found and allow the next rule to use that comment to add the date to a renamed file.
In short, do I really have to recreate a date search pattern or other common search pattern each time? If that's the case, it's fine. I just don't want to find out later I did all that repetitive work for nada.
Thanks for your help.
-eco