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 mK9Wi
Output for 4.3.0 - 7.1.0
hello, you?hello, . please don't remove you?