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<?php preg_match('/^(?P<no>\d+)\,/', '26, 2016.12.30', $matches); var_dump($matches);
based on fAv5p
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
array(3) { [0]=> string(3) "26," ["no"]=> string(2) "26" [1]=> string(2) "26" }