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run code in 200+ php & hhvm versions
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<?php $matches = null; $returnValue = preg_match('/[<>"\/;:=]/', '="refresh" content="0; url=http://orba.pl/" />', $matches); var_dump($returnValue, $matches);
based on au952
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
int(1) array(1) { [0]=> string(1) "=" }