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run code in 150+ php & hhvm versions
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<?php preg_match("/^(?P<dir>img|js|css)\/(?P<path>[/a-zA-Z0-9\-._~!$&'()*+,;=:@]+)$/", 'css/jquery.tweet.css', $m); var_dump($m);
Output for 5.2.3 - 7.1.0
Warning: preg_match(): Unknown modifier 'a' in /in/cGYVK on line 5 NULL
Output for 5.2.0 - 5.2.2
<br /> <b>Warning</b>: preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Unknown modifier 'a' in <b>/in/cGYVK</b> on line <b>5</b><br /> NULL
Output for 4.4.3 - 5.1.6
<br /> <b>Warning</b>: preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Unknown modifier 'a' in <b>/in/cGYVK</b> on line <b>5</b><br /> array(0) { }
Output for 4.3.11 - 4.4.2
<br /> <b>Warning</b>: preg_match(): Unknown modifier 'a' in <b>/in/cGYVK</b> on line <b>5</b><br /> array(0) { }
Output for 4.3.0 - 4.3.10
<br /> <b>Warning</b>: Unknown modifier 'a' in <b>/in/cGYVK</b> on line <b>5</b><br /> array(0) { }