I don't think it's a good idea to suggest there are "default" or "supported" formats by way of example. The regex are the most concise definition of what is supported. True, most people don't understand regex. But the best way to deal with that is to provide an example for each expression and "walk through" exactly how the pattern recognition works. Then it would be clear what file names will be recognized, how much flexibility there is, and possibly what modifications would be required to handle different or multiple patterns.
