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@ 2017-05-25T09:24:53Z

<?php

var_dump(preg_match('/^[a-zA-Z]{2}$/i', 'RU'));
var_dump(preg_match('/[a-z]{2}/i', 'eu'));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

48.63 ms | 402 KiB | 5 Q