uri_mapping

<?php

$str = "/parent/:dbname/:collname/:id";

function uri2regex ($str) {
    $word = "([0-9a-zA-Z_-]+)";
    $flag = preg_match_all("/:\w+/",$str, $matches);
    $params = $matches[0];
    array_walk($params, 'uriNormalize');
    var_dump($params);
    $ret = preg_replace("/:\w+/", $word, $str);
    $ret = str_replace("/", "\/", $ret);
    return "/^" . $ret . "/";
}

function uriNormalize (&$item) {
    $item = str_replace(":", "", $item);
}

$regex = uri2regex($str);

var_dump($regex);

$uri = "/parent/foo_db/bar_coll/200";

$flag = preg_match_all($regex, $uri, $matches);

var_dump($flag);

var_dump($matches);