Extract the citekeys from the TeX auxiliary-file string s (using regular expressions)

Test that the input can be parsed as BibTeX

Replace literal names (plaintext citations) in the TeX document string tex with
cite* commands, for names that are recognized by patterns generated from references.

Generate sequence of replacement maps from the Reference r,
with :match, :output, and :priority keys.

Extract the citekeys from the TeX document string s. This uses simple
regular expressions and will capture commented-out citations as well.

Parse TeX string, simplify, write TeX string, and normalize to Unicode NFC.