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run code in 150+ php & hhvm versions
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<?php $subject = <<<EOL 1. first 2. second 3. third EOL; preg_match_all('/^.{1,20}?$/im', $subject, $matches, PREG_PATTERN_ORDER); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> array(3) { [0]=> string(8) "1. first" [1]=> string(9) "2. second" [2]=> string(8) "3. third" } }