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run code in 200+ php & hhvm versions
Bugs & Features
<?php $html = '<b>smth</b>, <b>smth</b>'; var_dump(!preg_match('|</b>.*[A-zА-яЁё0-9]+.*<b|', $html));
based on Luqct
Output for 4.3.0 - 7.2.0
bool(true)