// Using `x` flag with `re` shorthand
// Meta-chars like \d can be escaped using single slash.
// Plugin should specify `useRe` option.

re`/

  # A regular expression for date.

  (?<year>\d{4})-    # year part of a date
  (?<month>\d{2})-   # month part of a date
  (?<day>\d{2})      # day part of a date

/x`;