Google Apps Script and Spreadsheet bindings to count the number of volumes in a book inventory.

The syntax is human-readable and accomodates (lists of) numbered or named volumes, ranges of numbered volumes, specific counts, and groups of volumes:

List of volumes	Count
1-10, 15-18	14
00, 1, 1.5, 2-4	6
1-6, Collector [1-3], 2 * Art Book	11
Collector [Sleeve [1-3], Sleeve [4-6], 2 * Extras]	8