Format a range of pages, accounting for both consecutive and non-consecutive pages.
format_page_range(pages)A string describing the pages.
Formatted page range.
Figures out whether there is one page or more than one. Add the appropriate prefix ("p." or "pp.").
format_page_range("99")
#> [1] "p. 99"
format_page_range("72 and 103")
#> [1] "pp. 72 and 103"
format_page_range("50--75")
#> [1] "pp. 50--75"