3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = 'hello, [how]. please don\'t remove [are] you?'; echo preg_replace('#\s*\[.+\]\s*#', ' ', $a); echo preg_replace('~\h*\[(?>[^][]++|(?R))*+]\h*~', ' ', $a);
based on kfZ7T
Output for 4.4.9, 5.2.4 - 7.1.0
hello, you?hello, . please don't remove you?
Output for 4.3.0 - 4.4.8, 5.0.0 - 5.2.3
hello, you?hello, . please don't remove you?