Wow. The parsing of inline code blocks is broken.
Explanation and solution in >>29 2020-08-02.
the URL regex in SchemeBBS should be changed to exclude "." and ")" that appear at the end of the URL
The closing paren cannot be naively excluded because it would break wikipedia links. Also, the regex library used by SchemeBBS is broken in numerous http://textboard.org/prog/39#t39p100 https://textboard.org/prog/34/133-164 ways, so it's best to keep regexps as simple as possible. Just put a space or a newline after your URLs.