assert($s->matchGroups() === array(0 => '0'));
assert($s->scan('/(?P<one>\\d)\\d{2}.(\\d(\\d))/') === '123456');
assert($s->matchGroup(0) === '123456');
assert($s->matchGroup('one') === '1');
assert($s->matchGroup(2) === '56');
assert($s->matchGroup(3) === '6');
assert($s->matchPos() === 1);
assert($s->pos() === 7);
$s->unscan();
//repeat
assert($s->pos() === 1);
assert($s->match() === '0');
assert($s->matchGroup(0) === '0');
assert($s->matchGroups() === array(0 => '0'));
// test check and match_* functions the same data as we just used for scan
assert($s->check('/(?P<one>\\d)\\d{2}.(\\d(\\d))/') === '123456');
assert($s->matchGroup(0) === '123456');
assert($s->matchGroup('one') === '1');
assert($s->matchGroup(2) === '56');
assert($s->matchGroup(3) === '6');
assert($s->matchPos() === 1);
assert($s->pos() === 1);
// but check pos hasn't moved.
$s->check('/\\d+/');
assert($s->match() === '123456789');
$s->unscan();
//repeat
assert($s->pos() === 1);
assert($s->matchGroup(0) === '123456');
assert($s->matchGroup('one') === '1');
assert($s->matchGroup(2) === '56');
