You can specify the required pattern in the inspection options.

Recommended naming conventions: it has to start with a lowercase letter, use camel case and no underscores.

Example:

  fun fibonacciNumber(index: Int): Long = when(index) {
      0 -> 0
      else -> {
          // does not follow naming conventions: contains underscore symbol (`_`)
          var number_one: Long = 0
          // does not follow naming conventions: starts with an uppercase letter
          var NUMBER_TWO: Long = 1
          // follow naming conventions: starts with a lowercase letter, use camel case and no underscores.
          var numberThree: Long = number_one + NUMBER_TWO

          for(currentIndex in 2..index) {
              numberThree = number_one + NUMBER_TWO
              number_one = NUMBER_TWO
              NUMBER_TWO = numberThree
          }
          numberThree
      }
  }