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run code in 150+ php & hhvm versions
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<?php $usernameCheck = 'dani'; var_dump(false ==== (bool)!preg_match('/[^a-z_\-0-9]/i', $usernameCheck));
Output for 5.3.0 - 5.4.30
Parse error: syntax error, unexpected '=' in /in/nsAb2 on line 4
Process exited with code 255.