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@ 2016-10-05T11:35:10Z

<?php
$str = "еще";
$valid_string_expr = '/^[а-я]+$/u';
var_dump(preg_match($valid_string_expr, $str));
$str = "ещё";
var_dump(preg_match($valid_string_expr, $str));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive previewkey bindings

26.27 ms | 405 KiB | 5 Q