$s->posShift(2);
assert($s->pos() === 5);
$s->posShift(-1);
assert($s->pos() === 4);
$s->posShift(99);
assert($s->pos() === strlen($string));
$s->posShift(-900);
assert($s->pos() === 0);
$s->reset();
$string = '0123456789';
$s->string($string);
assert($s->peek() === '0');
assert($s->peek(1) === '0');
assert($s->peek(2) === '01');
assert($s->peek(20) === $string);
assert($s->get() === '0');
assert($s->get(1) === '1');
assert($s->get(2) === '23');
assert($s->rest() === '456789');
assert($s->get(20) === '456789');
assert($s->eos());
assert($s->rest() === '');
$s->reset();
assert($s->pos() === 0);
// test scan and match_* functions, and unscan
assert($s->scan('/\\d/') === '0');
assert($s->pos() === 1);
assert($s->match() === '0');
assert($s->matchGroup(0) === '0');
assert($s->matchGroups() === array(0 => '0'));
assert($s->scan('/(?P<one>\\d)\\d{2}.(\\d(\\d))/') === '123456');
