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run code in 150+ php & hhvm versions
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<?php $string = 'This is a test!'; var_dump(trim(preg_replace('/[^a-zA-Z0-9aîâs?t?AÎÂST\s\-]/u','', strtolower($string))));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(14) "this is a test"