extends: existence
message: "'%s' should be in lowercase."
link: 'https://developers.google.com/style/colons'
level: warning
scope: sentence
# The match is the word itself, not ': X', and `nonword` is off. Both are
# required for a project Vocab to work: Vale compares accept.txt entries
# against the matched text, and `nonword: true` opts out of that entirely.
# So a proper noun after a colon can be exempted by adding it to accept.txt.
# The guide's other exemption, notice labels, is handled by the lookbehinds;
# headings are already excluded by `scope: sentence`. See issue #20.
tokens:
  - '(?<!Note: )(?<!Caution: )(?<!Warning: )(?<!Success: )(?<=:\s)[A-Z]\w+'