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run code in 150+ php & hhvm versions
Bugs & Features
<?php $host = 'www.ms.av'; $https = 'on'; preg_match('^(?:(www)|www\.([^.]+))(\.[^.]+\.[^.]+)\z', $host, $matches); var_dump($matches);
based on qbuKm
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier '.' in /in/jQ89W on line 4 NULL
Output for hhvm-3.12.0
Warning: Unknown modifier '.': [^(?:(www)|www\.([^.]+))(\.[^.]+\.[^.]+)\z] in /in/jQ89W on line 4 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Unknown modifier '.' in /in/jQ89W on line 4 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '.' in /in/jQ89W on line 4 array(0) { }