rfc5646privateuse top-level property

Implementation

final rfc5646privateuse = rule(
  'privateuse',
  concatenation([
    literal('x'),
    variableRepetition(
      concatenation([
        literal('-'),
        variableRepetition(alphanum, min: 1, max: 8),
      ]),
      min: 1,
    ),
  ]),
);