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run code in 150+ php & hhvm versions
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<?php $text = "0,2-16 км/час"; preg_match('/^[1-9]{1}$|^[1-4]{1}[0-9]{1}$|^50$/', $text, $m); var_dump($m[0]);
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: 0 in /in/qghjC on line 5 NULL
Output for hhvm-3.12.0
Notice: Undefined index: 0 in /in/qghjC on line 5 NULL
Output for hhvm-3.10.0
Notice: Undefined index: 0 in /in/qghjC on line 26 NULL
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 0 in /in/qghjC on line 5 NULL