3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'foo the moo cow not the moo cow is the cow the moo cow is the cow not the moo cow bar'; print preg_replace('/(\b.*\b)\1/', '', $str);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
foo the moo cow not not the moo cow bar