extends: capitalization
message: "'%s' is a heading and should be in sentence case."
level: error
scope: heading
match: $sentence
indicators:
  - ":"
  - "."
  - ")"
exceptions:
  - k    # ignores lowercase k-NN
  - '[A-Z]{2,}' # ignores all acronyms
  - '([A-Z][a-z0-9]+){2,}' # ignores all camel case words