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run code in 150+ php & hhvm versions
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<?php $x = "oauth2provider.server.hello"; preg_match('~^oauth2provider.server.([a-zA-Z0-9]+)$~', $x, $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(27) "oauth2provider.server.hello" [1]=> string(5) "hello" }