3v4l.org

run code in 300+ PHP versions simultaneously
<?php $testText = <<< TEXT If you are interested in redistribution or republishing of this document in whole or in part, either modified or unmodified, and you have questions, please contact the Copyright@ holders at ยป doc-license@lists.php.net. Note that this address is mapped to a publicly archived mailing list. For security related issues (in PHP or our websites) please contact security@php.net. If you would like to contact the webmasters for some other reason, please write to php-webmaster@lists.php.net. Note that this address is mapped to a mailing list and a newsgroup, so every message you send will be stored in public archives at multiple servers. TEXT; preg_match_all("/\b[A-Za-z0-9_\-\.\+]+@[A-Za-z0-9_\-\.]+\b/", $testText, $result); print_r($result);
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 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 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 ( [0] => Array ( [0] => doc-license@lists.php.net [1] => security@php.net [2] => php-webmaster@lists.php.net ) )

preferences:
242.14 ms | 406 KiB | 381 Q