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run code in 150+ php & hhvm versions
Bugs & Features
<?php $value = '20100'; $pattern = '(\d{4}(-\d{2})?(-\d{2})?( \d{2})?(:\d{2})?(:\d{2})?)'; var_dump(preg_match($pattern, $value));
Output for 4.3.0 - 7.1.0
int(1)