public function nonspaces()
{
$this->many(Character::space(true));
return $this;
}
/**
* zone = (FWS ( "+" / "-" ) 4DIGIT) / obs-zone
*/
private function zone()
{
return (new Hexpress())->find(function ($hex) {
$hex->either([(new Hexpress())->has($this->FWS())->either(['+', '-'])->limit(Character::digit(), 4, 4), $this->obsZone()]);
}, 'zone');
}
