/usr/share/doc/cadabra/reserved/regex.tex is in cadabra 1.46-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | \cdbreserved{regex}{}
Denotes a regular expression name pattern. The first argument is a
symbol and the second argument is a string containing the regular
expression.
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