3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php setlocale(LC_ALL, 'ru_RU.cp1251'); echo preg_replace ( '/\D/', '_', 'ёйцукенгшщзхъфывапролджэячсмитьбю1234567890' );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
__________________________________________________________________1234567890