The configuration syntax only allows for a single regular expression unfortunately.
Please see the documentation page here:
https://docs.squiz.net/funnelback/docs/latest/collections/collection-types/web/included-and-excluded-web-content.html#regular-expressions-in-includeexclude-patterns
However, in this case you may not need a regular expression.
/wp-json/,/feed
may be sufficient. This would exclude any URLs with those exact patterns in them, the /wp-json/ rule is likely to be fine as-is. The second rule may have false positives, for example, /news-articles/feeding-goats-on-my-farm.html would trigger the /feed part and be excluded.
In that case, a simplified regexp here would be this:
regexp:.\/wp-json\/.|\/feed$
The rest of the default terms in exclude_patterns are of questionable value, I generally delete them to simplify the pattern. /cgi-bin/, /vti, /_vti aren't used nowadays, and patterns like google-analytics.com don't need to be excluded because they shouldn't be in your include_patterns.
