3v4l.org

run code in 500+ PHP versions simultaneously
<?php $str = "<t@t.com>\n<tatacom>\n<t@ata@com>"; $re = '/<([^<>@]+@[^<>@]+)>/'; if (preg_match_all($re, $str, $matches)) { print_r($matches[1]); }

preferences:
22.43 ms | 476 KiB | 4 Q