3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $content = '[btn href="(.?)" "(.?)"]'; echo preg_replace('#\[btn href="(.*?)" "(.*?)"\]#i', '<a href="$1" class="btn"> $2</a>', $content);
based on dbOWi
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<a href="(.?)" class="btn"> (.?)</a>