3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_replace('#.*_([a-z])+\.(jpg|gif|png|jpeg)$#','_n','http://photos-h.ak.fbcdn.net/hphotos-ak-frc3/t1.0-0/1538683_705144079517314_1930601228_n.jpg', 1));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
string(2) "_n"