3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo preg_replace("/-/", "_", '08_05_2013_17_15_38-Mail-an-VN 25.04.2013.pdf');
Output for 4.3.0 - 7.1.10
08_05_2013_17_15_38_Mail_an_VN 25.04.2013.pdf