When setting up a data source it's necessary to specify a file pattern. Here are a some quick examples:
Duco accepts any valid Java pattern. If you need anything more complex, search for "Java pattern matching" or "Java regular expressions" on the Web or in a Java manual.
Things to note:
* says: zero or more of whatever came before it
. says: any character
\. says: the character "."
So .* is zero or more of anything and \.* is zero or more dots.