When setting up a data source it's necessary to specify a file pattern. Here are a some quick examples:
*Patterns are case-sensitive, so should reflect the case of the underlying files. File names cannot exceed 255 characters.
The above should be sufficient to define the pattern you need. It's usually good practice to keep file patters simple. E.g., just a fixed file name (first row in the table) or use a file prefix (second line in the table).
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.