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@ 2014-10-16T14:39:19Z

<?php

var_dump(preg_match('~^[^A-ZА-ЯЁ]{0,2}_?$~u', ''));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

47.04 ms | 402 KiB | 5 Q