Group a list of sorted resource ids on their first letter of the title or another rsc property. After grouping, it splits this list in a number of more-or-less…
Similar to group_firstchar, but always uses the title column from the rsc table.
Filter a list of resource ids on category, or test if a single resource id belongs to a category.
is_not_a mirrors is_a. It is particularly useful when iterating over a category and excluding members of a sub-category (iterating over all images associated…
Filter a list of resource ids so that only the visible ids remain.

Regular Expressions Filters Resources