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@ 2016-03-09T06:29:35Z

<?php
var_dump(preg_match('/^\w+$/', '人1994'));
var_dump(preg_match('/^\w+$/', '啊1994'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

23.59 ms | 474 KiB | 4 Q