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run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = "BEGIN_DATA_567 329 ... END_DATA_567 BEGIN_DATA 561 .... END_DATA"; preg_match("/\bBEGIN_DATA\b(.+)\bEND_DATA\b/", $str, $match); echo $match[1];
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: 1 in /in/RO7ff on line 13
Output for hhvm-3.12.0
Notice: Undefined index: 1 in /in/RO7ff on line 13
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/RO7ff on line 13