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run code in 150+ php & hhvm versions
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<?php $input_date = '1912-12-22'; if(!preg_match(/[0-9]{4}-(0[1-9]|1[012])-(0[1-9]|1[0-9]|2[0-9]|3[01])/,$input_date, $aux_date)) echo 'match';
Output for 5.3.0 - 5.4.22
Parse error: syntax error, unexpected '/', expecting ')' in /in/O2PXD on line 3
Process exited with code 255.