3v4l.org

run code in 150+ php & hhvm versions
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<?php $input_date = '1912-12-22'; if(!preg_match("d{4}-(0[1-9]|1[012])-(0[1-9]|1[0-9]|2[0-9]|3[01])",$input_date, $aux_date)) echo 'match';
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/UQCC4 on line 3 match
Output for 4.3.0 - 4.3.10, hhvm-3.10.0 - 3.12.0
Warning: Delimiter must not be alphanumeric or backslash in /in/UQCC4 on line 3 match