A way to determine if final character of a title is a numeral?

I'm tinkering with the Bluebook style for law review articles. Is there a way in CSL to check whether the final character of a title is a numeral? In bluebook style, the page number citation comes right after a title UNLESS the title itself ends in a numeral, in which case the page cite requires ", at" in order to avoid confusion.

Example:

1.BERNARD SCHWARTZ, A HISTORY OF THE SUPREME COURT 140 (1993).

2. ERIC FONER, RECONSTRUCTION : AMERICA’S UNFINISHED REVOLUTION, 1863-1877, at 336.
  • no, sorry, no checking for content of variables at all in CSL. You could add the comma in the title as a workaround, I think that'd work?
  • Hmm, better than nothing but not perfect because you need “at” too. And I couldn’t add that at the end of the title because then it would render in small caps. It's not a huge problem and can always be fixed in editing later.
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