Sometimes there are some things that are not
allowed in source code. It is the simplest way
to just match those strings by a regular expression.
Like a forbidden or deprecated include in C++ or
just a simple TODO in a comment.
Configured two lines with regex.
Added a file with matching strings and saw that
both regex are found.
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E999 SyntaxError: EOL while scanning string literal
After thinking it over, I don't think this is something we're going to include in Review Bot itself. However, because of the entry-points mechanism, you can ship your own package that registers this tool and then Review Bot will discover it and make it available.