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run code in 200+ php & hhvm versions
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<?php $input_date = '1912/12/22'; if(!preg_match('(19|20)[0-9]{2}[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])',$input_date, $aux_date)) echo 'match';
Output for 4.3.11 - 7.1.7
Warning: preg_match(): Unknown modifier '[' in /in/u7nc9 on line 3 match
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '[' in /in/u7nc9 on line 3 match