3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $string = "Patient will come in earlier\n\nPacket emailed 2012-06-14 11:30:06\n\nPacket emailed 2012-06-12 12:32:04"; $pattern = "/(packet )(e{0,1}mailed) (\d{4}-)(\d{2}-\d{2})/i"; preg_match_all($pattern,$string,$matches); print_r($matches[-1]); ?>
based on r2CZ0
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: -1 in /in/EAJg3 on line 8
Output for hhvm-3.12.0
Notice: Undefined index: -1 in /in/EAJg3 on line 8
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: -1 in /in/EAJg3 on line 8