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run code in 150+ php & hhvm versions
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<?php $dateofbirth = '30/11/80'; echo preg_match("/^([0-9]{2})/([0-9]{2})/([0-9]{4})$/", $dateofbirth);
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier '(' in /in/DHhvs on line 3
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '(': [/^([0-9]{2})/([0-9]{2})/([0-9]{4})$/] in /in/DHhvs on line 3
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '(' in /in/DHhvs on line 3