3v4l.org

run code in 300+ PHP versions simultaneously
<?php $subject = <<<EOL 1. first 2. second 3. third 12345678901234567890 123456789012345678903 EOL; preg_match_all('/^.{1,20}?$/im', $subject, $matches, PREG_PATTERN_ORDER); var_dump($matches[0]);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(4) { [0]=> string(8) "1. first" [1]=> string(9) "2. second" [2]=> string(8) "3. third" [3]=> string(20) "12345678901234567890" }

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334.45 ms | 406 KiB | 460 Q