<?php
    $regex_array = array(
        "/a+/" => 0,
        "/b/" => 0,
        "/c/" => 0,
        "/d/" => 0
    );
        
    $strings_array = array(
        "aa",
        "ab",
        "abc",
        "abcd"
    );
         
    foreach ($regex_array as $key => $value)
        foreach ($strings_array as $current_string)
            if (preg_match($key, $current_string))
         $regex_array[$key]++;
         
    foreach ($regex_array as $key => $value)
        echo($key . " => " . $value . " matchings\n");
?>