3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $input_date = '19122/12/22'; if(!preg_match('(19|20)[0-9]{2}[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])',$input_date, $aux_date)) echo 'match';
Output for 4.3.11 - 7.1.0
Warning: preg_match(): Unknown modifier '[' in /in/N7sWV on line 3 match
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '[' in /in/N7sWV on line 3 match