<?php $r = '/^[А-Я]{1}[0-9]{3}[А-Я]{2}[0-9]{3}$/u'; $pattern = 'Я000ЯЯ000'; $check = function ($str) use ($r, $pattern) { return (bool) preg_match($r, $str . mb_substr($pattern, mb_strlen($str))); }; foreach (['ББ12', 'И7'] as $test) { echo json_encode([$test, $check($test)], JSON_UNESCAPED_UNICODE), PHP_EOL; }
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