router and regular expressions

routes.php

<?php
// first route
Router::connect(
    '/:slug',
    array(
        'controller' => 'Startups',
        'action' => 'view'
    ),
    array(
        'slug' => '[0-9A-Za-z_-]+Startup', //just an example
        'pass' => array ('slug')
    )
);
//second route
Router::connect(
    '/:slug',
    array(
        'controller' => 'People',
        'action' => 'view'
    ),
    array(
        'slug' => '[0-9A-Za-z_-]+Person[0-9A-Za-z_-]+', //just an example
        'pass' => array('slug')
   )
);