<?php

$pattern = "/a[bc]+/";

$i = 0;
$i += preg_match($pattern, "aaaaab")? 1 : 0;
$i += preg_match($pattern, "a")? 1 : 0;
$i += preg_match($pattern, "bcbc")? 1 : 0;
$i += preg_match($pattern, "acccc")? 1 : 0;
$i += preg_match($pattern, "cbbbc")? 1 : 0;

echo($i);

?>