3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $subject = "#CAPTION"; $pattern = '/^#([A-Z]+)$/'; echo preg_match($pattern, $subject); print_r($matches);
Output for 5.0.4 - 7.1.0
1 Notice: Undefined variable: matches in /in/H3QXX on line 5
Output for 4.3.0 - 5.0.3
1 Notice: Undefined variable: matches in /in/H3QXX on line 5