Simple Instructions:
Filters allows you to group together into a subcollection all documents in an
index for which a metadata value matches a given pattern.
To create a filter, click the "Define Filters" tab and enter a name for the
new filter into the "Name the subcollection filter" field. Next choose a
document attribute to match against, either a metadata element or the name of
the file in question. Enter a regular expression to use during the matching.
You can toggle between "Including" documents that match the filter, or
"Excluding" them. Finally, you can specify any of the standard PERL regular
expression flags to use when matching (e.g. "i" for case-insensitive matching).
Finally, click "Add Filter" to add the filter to the "Defined Subcollection Filters"
list.
To remove a filter, select it from the list and click "Remove Filter".
To alter a filter, select it from the list, change any of the values that
appear in the editing controls and click "Replace Filter" to commit the changes.