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run code in 150+ php & hhvm versions
Bugs & Features
<?php $text = "0,2-16 км/час"; preg_match('/(\(^[1-9]{1}$|^[1-4]{1}[0-9]{1}$|^50$))/', $text, $m); var_dump($m);
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Compilation failed: unmatched parentheses at offset 38 in /in/GAKsE on line 4 NULL
Output for hhvm-3.12.0
Warning: Compilation failed: unmatched parentheses at offset 38 in /in/GAKsE on line 4 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Compilation failed: unmatched parentheses at offset 38 in /in/GAKsE on line 4 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unmatched parentheses at offset 38 in /in/GAKsE on line 4 array(0) { }