3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo preg_replace('([^a-z0-9])i', '_', 'a colour-with random crap in it');
based on 3kRdE
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
a_colour_with_random_crap_in_it