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run code in 150+ php & hhvm versions
Bugs & Features
<?php $value = '2010-05-29 15:54:54'; $pattern = '(\d{4}-\d{2}-\d{2} \d{2}:\d{2}(:\d{2})?)'; var_dump(preg_match($pattern, $value));
Output for 4.3.0 - 7.1.0
int(1)