/usr/lib/R/site-library/rematch/INDEX is in r-cran-rematch 1.0.1-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | re_match Match a regular expression to a character
vector
rematch Match Regular Expressions with a Nicer 'API'
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