3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $inputP = '[payer_id=1]'; $input = '[payer_id=1] [ST#3434343] [category_id=12]'; $output = preg_match("/(_*)/", $inputP, $matches); var_dump($matches);
based on DERcA
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.17.3, 7.0.0 - 7.3.0rc4
array(2) { [0]=> string(0) "" [1]=> string(0) "" }