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run code in 150+ php & hhvm versions
Bugs & Features
<?php $filter = "id eq '2'"; preg_match('\d+', $filter, $a); var_dump($a);
based on mNFKf
Output for 5.2.0 - 5.6.21, 7.0.0 - 7.1.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/72TQc on line 4 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Delimiter must not be alphanumeric or backslash in /in/72TQc on line 4 NULL
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/72TQc on line 4 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/72TQc on line 4 array(0) { }