3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $value = 0; $regexp = '(-)?[0-9]+(\.[0-9][0-9]?)?'; preg_match($regexp, $value, $matches); var_dump($matches);
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier '?' in /in/opQvu on line 5 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '?': [(-)?[0-9]+(\.[0-9][0-9]?)?] in /in/opQvu on line 5 NULL
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Unknown modifier '?' in /in/opQvu on line 5 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '?' in /in/opQvu on line 5 array(0) { }