<?php

function regexCheckPassword($password)
{

    $first = preg_match('/^\w{10,15}$/', $password);
    $second = preg_match('/[a-z]/', $password);
    $third = preg_match('/[A-Z]/', $password);
    $last = preg_match('/[A-Z]{2}|[a-z]{2}/', $password);

    if (!$first || !$second || !$third || $last) {
        return false;
    }

    return true;
}

var_dump(regexCheckPassword('aBpLoCkDmT'));